Default [Q] Questions about mobile data issues..

I've even having mobile data problems(Data working for a few minutes and then disconnecting from network) since I last updated the Rom I was using, Quantum Rom, and I have tried reflashing and flashing a different Rom, but no luck.

I am aware that there are threads of people having this issue, I have some questions though that I need answered. I'm going to be busy after tomorrow and I need to try and fix it now, so that's why I want to make sure I will be "safe."

Could I possibly solve this issue with a new modem?
If I need to downgrade to stock, how do I make sure I am even able to, I've read that I must have a certain bootloader?
Can I solve this issue without going nuts on my phone?

I haven't seen any resolved threads that have worked, besides the downgrade and modem option, since I haven't done that. Could someone post some other methods.

I'm sorry to be of a lazy poster, I am in class and don't have much time when I get home. Thanks!