Hey, anyone have issues with their Dongles lasting? In particular, I have a pack of 4 Donner receivers (battery operated) and I've had one just stop working entirely and it's a crap-shoot as to how long the others last without plugging them in. I had them fully charged before doing a practice session and one ran out of juice about 3 hrs in. Once I plugged it in, it was fine but man...These are brand new (in the sense I've never used them for a live show and only practiced with them a few times). They're straight from Donner. I just ordered another pack but man, maybe I just got a lemon pack but I have no trust at all in the longevity here. What are the run times others have with the battery operated and do you even trust it? Do you just plug them in to be safe? Can you combine Lixada receivers with a Donner transmitter or vice versa?