TM CQBr recoil miss firing

[brewer17]

My TM CQBr recoil has started playing up today. It miss fires in every mag. I use excel .23g bbs but Iv tried .2gs and it still does the same. It will fire a few bbs then nothing then a few more. Iv cleaned the barrel and the mags but that hasnt worked. The hop rubber looks fine too. Can anyone shed any light on the problem.