Absolutely. Usually I sit by the computer all night long during a session but if you don't, this issue is a show stopper.

The first abnomaly IMO occurs where deviation goes from 3W in one line to 576W in the next line. From this point in time the amplitude remains elevated and never gets back to normal AFAICS.

192,1117.302,"Mount",0.455,0.075,-0.013,0.102,-0.011,0.061,10,E,62,S,,,1108899,744.61,0
193,1122.556,"Mount",0.408,0.134,0.062,0.035,0.024,0.000,23,W,0,,,,1103255,742.72,0
194,1127.830,"Mount",0.450,0.136,0.027,0.078,0.003,0.046,3,W,47,S,,,1106874,743.93,0 <---
195,1133.130,"Mount",0.341,0.989,1.000,0.307,0.599,0.184,567,W,188,S,,,1123036,749.35,0 <---
196,1138.938,"Mount",0.297,0.645,0.654,0.275,0.352,0.164,333,W,168,S,,,1105605,743.51,0

and a short while later another "push" can be seen where the amplitude enters the next level and deviation goes from 310E to 3203E from one line to the next. Like the neighbour's cat had jumped off the roof and landed on your scope.

247,1445.822,"Mount",0.115,0.436,-0.547,-0.124,-0.328,-0.074,310,E,76,N,,,1115522,746.83,0
248,1450.231,"Mount",-15.966,-12.305,-12.843,-15.536,-3.385,-3.385,3203,E,3467,N,,,1115522,746.83,0

The correspoinding part (for the latter) in the Ekos logfile is - I believe - this:
[2022-10-27T19:50:39.615 EDT DEBG ][ org.kde.kstars.ekos.guide] - ################## BEGIN PROCESSING ##################
[2022-10-27T19:50:39.615 EDT DEBG ][ org.kde.kstars.ekos.guide] - Star X: 931.945 Y: 482.274 arcsecs: 6882.22 3561.49
[2022-10-27T19:50:39.615 EDT DEBG ][ org.kde.kstars.ekos.guide] - Reticle X: 931.83 Y: 481.837 arcsecs: 6881.37 3558.27
[2022-10-27T19:50:39.615 EDT DEBG ][ org.kde.kstars.ekos.guide] -

---

> AFTER ROTATION Diff RA: -3.24931 DEC: -0.74221
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - Multistar getDrift, reticle: 931.83 481.837 guidestar 931.115 480.11 so offsets: 0.714844 1.72736
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - " # x y flux HFR SNR Ref: # x y flux HFR SNR dRA dDEC"
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 0 578.4 209.3 555933 2.18 527.2 Ref: 2 578.6 209.9 549668 2.10 524.2 4.20 0.73"
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 2 542.6 402.9 480287 2.83 490.0 Ref: 3 542.7 403.4 468707 2.54 484.1 3.89 0.83"
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 3 239.4 199.0 436452 3.76 467.1 Ref: 4 239.5 199.5 435753 3.72 466.8 3.76 0.94"
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 5 907.2 220.8 390441 2.38 441.8 Ref: 5 907.4 221.3 385081 2.35 438.8 3.57 0.89"
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 6 447.5 314.3 319711 3.39 399.8 Ref: 6 447.5 314.9 316121 3.30 397.6 4.43 0.24"
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 8 534.3 276.4 293348 2.68 383.0 Ref: 7 534.5 277.0 290733 2.61 381.3 4.45 1.10"
[2022-10-27T19:50:39.616 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 9 521.9 408.0 289878 2.72 380.7 Ref: 8 522.2 408.5 284753 2.82 377.3 4.18 2.07"
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] - "MultiStar 10 554.5 118.8 280503 2.49 374.5 Ref: 9 554.7 119.4 276743 2.52 372.0 3.86 1.12"
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] - MultiStar: Drift median 4.03672 0.913708 8 of 100 #guide 10
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] -

---

> MultiStar: Diff RA: 4.03672 DEC: 0.913708
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] - Processing Axes
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] - drift[ "RA" ] = 4.03672 integral[ "RA" ] = 0.107759
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] - pulse_length[ "RA" ] = 310 ms, Direction = "Decrease RA"
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] - drift[ "DEC" ] = 0.913708 integral[ "DEC" ] = -0.307871
[2022-10-27T19:50:39.617 EDT DEBG ][ org.kde.kstars.ekos.guide] - pulse_length[ "DEC" ] = 76 ms, Direction = "Increase DEC"
[2022-10-27T19:50:39.632 EDT DEBG ][ org.kde.kstars.ekos.guide] - ################## FINISH PROCESSING ##################
[2022-10-27T19:50:39.633 EDT INFO ][ org.kde.kstars.ekos.capture] - "Guiding deviation 4.139 is still higher than limit value of 2 arcsecs."
[2022-10-27T19:50:39.677 EDT DEBG ][ org.kde.kstars.ekos.guide] - Capture complete.
[2022-10-27T19:50:40.041 EDT DEBG ][ org.kde.kstars.ekos.guide] - Executing operation "Subframing"
[2022-10-27T19:50:40.041 EDT DEBG ][ org.kde.kstars.ekos.guide] - Executing operation "Capturing"
[2022-10-27T19:50:40.041 EDT DEBG ][ org.kde.kstars.ekos.guide] - Capturing frame...
[2022-10-27T19:50:43.779 EDT DEBG ][ org.kde.kstars.fits] - Reading file buffer ( "1.0 MiB" )
[2022-10-27T19:50:43.961 EDT DEBG ][ org.kde.kstars.ekos.guide] - Received guide frame.
[2022-10-27T19:50:43.962 EDT DEBG ][ org.kde.kstars.ekos.guide] - Tracking box position synched.
[2022-10-27T19:50:43.962 EDT DEBG ][ org.kde.kstars.ekos.guide] - Capture complete, state= "Guiding"
[2022-10-27T19:50:43.962 EDT DEBG ][ org.kde.kstars.fits] - Sextract with: "1-Guide-Default"
[2022-10-27T19:50:44.026 EDT DEBG ][ org.kde.kstars.ekos.guide] - ################## BEGIN PROCESSING ##################
[2022-10-27T19:50:44.026 EDT DEBG ][ org.kde.kstars.ekos.guide] - Star X: 915.864 Y: 469.533 arcsecs: 6763.46 3467.4
[2022-10-27T19:50:44.026 EDT DEBG ][ org.kde.kstars.ekos.guide] - Reticle X: 931.83 Y: 481.837 arcsecs: 6881.37 3558.27
[2022-10-27T19:50:44.026 EDT DEBG ][ org.kde.kstars.ekos.guide] -

---

> AFTER ROTATION Diff RA: 94.8418 DEC: 114.731

At 19:50:39 Diff RA is reported as 4.03672 and 5 seconds later it's 94.8418? I can't see why. But that might be due to my limited understanding of it. Sorry, I'm afraid one of the big guns has to have a look at it.

Thanks!

Hopefully, one of the "big guns" will chime in.

I appreciate your efforts!

Ron

Alfred,

I've sent Ron instructions on how to send me more informative logs, and am happy to work with you as well--t's just sometimes it's just easier doing one thing at a time.
I'll email you the same instructions I emailed him.

If can edit and compile, I also have a suspicion about what to try--try changing the 4.0 on this line to a large number, like 40000.0
invent.kde.org/education/kstars/-/blob/m.../guidestars.cpp#L649

Hy

Also seeing this oscillation