Hey guys, I've just noticed a very specific case of battery drain, it is testable and repeatable, at least on my phones. I have an LG Optimus V with CM7.2 and a Samsung Exhibit II 4G with CM9 (I know, they're custom ROMs but it would be nice to confirm if it happens to others).
So this is what I do:
Connect the phone to WiFi, and Groove IP gets connected. All is fine (I can wait hours without using the phone) and the battery usage drops steadily and as slow as expected. But once Groove IP gets activated by a call, even if unanswered, from then on (and after hanging up if answered) the battery drain will be much higher, until I disconnect and reconnect WiFi. Then the slow, steady drain begins again. I don't have any of the troubleshooting options checked on the Samsung, and on the LG only the Partial Wake Lock, which I seem to need since I don't have service in that phone and keep in on Airplane mode with WiFi on.