Same problem .Before the update i could play nearly 6 Hours, after only 1 1/2 - 2 hours!! I played a lot of gigs with G10, but now its useless for me!
But now, i ihink :-) the g10 had a standby mode, if you did not Play. before the update it went only in standby , when the volumeknob of the guitar was at Zero .after the update it goes in standby mode if you did not play for about some minutes……
LINE6 FIX IT!!!!!