It shuts off from normal use when I encounter rough roads. If I hit a bump I'll look at the screen and it simply shuts off.
Http://www.mtbguru.com/ go there and all will be revealed my friend This is a common problem with 305/205... there is a battery connection in unit that thru use becomes strained(hence rough road shutdown) i followed the instructions in the blog and inserted a spacer in battery terminus and no more probs... good luck
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