Mine's a series 1 with motherboard in the CD100.
Never had problem 1, but just started using coolant relay in testing.
I've had issue# 2 (I think it's the same as problem # 5) numerous times. Before stopping mach I write down the DRO settings, and then reenter them after restart. Of course you have to manually ref the axes to 0, but at least you don't have to re-home and touch off.