Crashed my syma x5c several times this week, and now I'm facing a weird problem.

Immediately after taking off, the quad flies fine, but after 30-40 seconds, it stops responding to left roll and back pitch and just moves northeast constantly.

I have no idea why this is happening but I'm really bummed because I've only had this lovely quad since Monday. Can you guys give me advice?

Tried a reset?

Yeah, have reset several times and switched the props around.