today was the first time ive seen this happen with the halos so i just presume its the cold.
tried changing the batts but it did nothing (yes, they are duracell), luckily i have two halos. one worked better than the other, but still slightly dodgy and they are the same type!
one guy on our teams was 'jamming' nearly all the time, and i saw a few people hitting their sound activated ones, firing a few shots then hitting them again
paint was sweet though! just get some good stuff.