Good Morning

I have installed Kstars / Ekos under Kubuntu (20.04) and on the Raspian PI4, but I cannot expose for more than 30 seconds on both systems.

I do the following:
Start Kstars / Ekos
Connect the camera to the system (Kubuntu)
Switch on the camera, mode "M" and set the exposure time to "BULB"
Start the camera profile for my Canon in Ekos and start Indi.
Set an exposure time> 30 seconds.
The exposure starts and after 30 seconds the camera stops recording while EKOS counts down the remaining seconds.

As soon as I start recording via EKOS, the camera no longer shows BULB on the display, but rather 30 "

The indilog shows nothing conspicuous:

2020-09-29T08: 14: 05: [INFO] Exposure done, downloading image ...
2020-09-29T08: 13: 22: [INFO] Starting 40 seconds exposure.
2020-09-29T08: 09: 43: [INFO] Debug is disabled.
2020-09-29T08: 09: 43: [INFO] Debug is enabled.
2020-09-29T08: 09: 29: [INFO] Preset Bulb seconds selected.
2020-09-29T08: 09: 24: [INFO] World Coordinate System is enabled.
2020-09-29T08: 09: 24: [INFO] Device configuration applied.
2020-09-29T08: 09: 24: [INFO] Force BULB is enabled. All expsures shall be captured in BULB mode except for subsecond captures.
2020-09-29T08: 09: 24: [INFO] Upload settings set to client only.
2020-09-29T08: 09: 24: [INFO] Loading device configuration ...
2020-09-29T08: 09: 23: [INFO] Detected Canon EOS 350D DIGITAL Model Canon EOS 350D DIGITAL.
2020-09-29T08: 09: 23: [INFO] Canon DSLR Digital Rebel XT (normal mode) is online.

Jasem please help me.
I tried to find a solution to the problem in the forum. I found an entry that is more than 5 years old and a solution was not shown.

Best regards
Thomas