Ive repeatedly had this happen, I unlock some items equip them and then later on when i go back they are locked again, and i still have them on.Anyone else having this issue

I haven't had that issue, but what system are you playing on?

Are you resetting your Abilities? If so, you lose one level for getting your Level Credits back.

If you're not resetting your Abilities, then it's a very weird bug.

360, theres also an issue with Medium Body type players having HMGs. If you set one as your default as a Heavy BT and go play a game come back and switch to Medium and not change your default weapon you can play with the HMG still as long as you don't switch it later on.

I have reset them but not any time recently for it to have happened