No, GB was pushed to the X2 in the beginning of August. I know because I made a post on August 2nd when GB had just fixed an issue I was having. So, it's only been maybe five or so weeks. So, if it's been happening for three months, sounds like it was an issue with the phone from the start. Depending on how much personalization they've done to their phone, they might want to try a factory reset. I briefly looked in Manage Apps for something related to battery that you could clear defaults, settings, cache, etc. but couldn't find one. I would have tried that first, but, now all I can think of would be to factory reset. With how much I like my phone setup, I don't think I'd do a factory reset on my phone without doing more research though. Maybe try Google if you haven't already. Or posting in the general help forum. I know as far as the forum rules go, cross posting is frowned upon, but, I don't see why this issue couldn't be addressed in both forums. Seems like it could be an X2 specific problem or an Android problem.
But, hopefully someone else will have additional insight on this.