Sorry for disturbance, are there any plans to include new CEC library version that possibly could fix disconnects from Samsung TV for MK808B+?
LibreELEC 8.2 bbuild already have a patched libCEC and in current state there are no things that I can change to improve, meaning that with current kernel it won't get any better, sorry.
I had no issues when using MK808B+ with my Samsung TV, perhaps you can try using a different cable or different mini HDMI adapter?