Hey HeXiiK. If your not rooted I'm going to need to move you over to the LG Optimus V forum. Okie Dokie
You probably have installed a bad app, or you have been using an app killer (system optimizer) to much. First try pulling battery and holding power button down for 30 sec. then power back up. If that doesn't work try to figure out when your problems started and what apps you installed just before then. Delete one and see if that fixes the problem. If not re-install and try another. You can also go to settings/applications/running app's and see which ones are running, then go to about phone/battery usage and see if you find one that sticks out as using a lot of your battery.