Rehearsal starts at 8. By the time I get done with everything, it can be about 3-4 hours later when I plug it back in. Not getting used the whole time, so a lot of that is on standby.
I'm having the same problem with my unit, however, I use it once a week at church for about 4 hours, it is plugged into the base the rest of the week. Today it died in less than 40 minutes of rehearsal. What I have noticed additionally when plugging it back it, it will blink for a bit, perhaps a few minutes, then go back solid, almost as though it is signaling full charge. Unplugging and plugging back in again will repeat the same process.