I've had my Vita for about 6 months now and really enjoy it, but for the last 2-3 months I've had a hard time getting it to accept a charge. I have to wiggle the cord into juuuust the right spot for it to charge, and sometimes I can't get it to charge at all. As a result, I end up using it a lot less. Any ideas on a fix? Hope this isn't my system going bad already.