Complete electrical failure

yep, twice in the last two weeks. it has been outside. it rained/snowed during both times. it sat for a few days, then dead. it has been in the garage most of the winter, and has sat for over a month with no problems. i got a list or 9 or 10 items to get checked out when it goes to the dealer next. i was planning on taking it in next week, but it is going to snow so i will be waiting a few more weeks.....