@Nou, sorry if my terminology is incorrect. Just assumed memory leak is when memory is used up continuously, until the system has used all resources and causes things to crash. Let's not get bogged down with terminology!
As in my original postpost , I've had several sessions crash shortly after going to bed, and believe them to be from a lack of memory on the RPi.
I say this as I've documented the memory usage fill up, then the kstars logfile stops writing (kstars crashes) and the available memory increases and remains steady until I return to offload the imaging data several hours later.
Since really delving deeper (all the different memories, and purging the caches, etc), I've been unable to make it crash again, and as the nights are so short imaging isn't worth it just at present.
Again, I have a 'fix' that should work for me, but I'm disappointed that I've not been able to find the reason and solve the problem, but it does seem like there are others still seeing the same, perhaps without crashes...

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