My 7220 will shut down unprovoked during normal operation. When I try to restart it, it will crank but won't fire. I can walk away for it for a few hours and it will restart again only to shut down a few hours or a few days later during normal operation again. The new battery also drains after it sits for a few days. I am wondering if this is part of the same problem or two different issues. Anybody else experience this, or have any ideas?