It's never been a problem with the Optimus V since I've been a member in this forum. It doesn't mean it couldn't be the problem though.
Look over to my join date. That is how long I've been absorbing data on the "V".
What is a problem on one phone may not be with another.
But, this is all just advice for the OP to consider.
If taking the Battery out and holding the power button doesn't fix it for him The OP has plenty of other options.
We try not to put all our eggs in one basket over here in the V forum.
We are all just trying to give the OP all the known fixes for his problem, that way he can get it fixed sooner, and with less stress.
Sometimes an OP will mess his phone up so bad that it can not be saved, as is the case of the OP in the All Things Root Sticky. (factory resetting a rooted phone is usually fatal, but we still try to help save it).
This is not the case here of course.
Thank you for you understanding on this matter.
AndyOpie150