I bought another DNA250C mode (Triade), same problems.
 
	After another long chat with Evolv support I found freshly published firmware for 250c:
 
 
	Viola, 1.1 SP38 for now fixed this bug, I haven't tested it for a long time, but so far so good with two completely different builds.
 
	Hope this fix can help others who was bothered by this bug.