My Nokia lumia 625 has recently started draining its battery very quickly, I only have to send a couple of texts for it to die and trying to use the internet is useless, it's only about 10 months old (replacement for a broken one ) it drains overnight when I am asleep too
I'm really sorry that you're having some issues with your Nokia. I want to get this all sorted for you.
It sounds like the phone would need to come into our repair center to be looked at. The easiest way to get this looked into is by logging into your Virgin Mobile account here and going to your account > Plan and Device > Phone repair.
The tool will be able to give you several diagnostics and will let you book the phone in for repair if it deems it needs to come in.
Give this a go for me and let me know how you get on.