2002 325i throwing P0011, P0015 and P0444 codes

Hello everyone. I'm looking for some help on what I should do for the codes my car is throwing out. I've recently been having issues with it, loss of power while driving (near total loss unless I slam on the gas), rough idle (although that seems to have mostly gone away after the last oil change/air filter change), and my cruise control have randomly kicked off as well. For P0444 it looks like I'll just have to replace the purge valve and I already ordered one of those, but I haven't seen where someone had the other two codes together. I've seen posts with p0014 and p0015, but not p0011. Aside from replacing the camshaft sensors, could there be something major wrong? I've also had my transmission warning light come on (usually only after the cruise control has shut down on it's own) lately, although I think it has only happened 2-3 times. Could the issues be related? My car also has about 145000 miles on it, and while BMW said that the transmission fluid is 'lifetime', should I go ahead and replace it? I've read varying things on the forum, some recommend it, some say it can majorly mess things up. Thanks for any advice