Glock 18c misfiring

[tenacioustom]

My Cyma Eap Glock 18c, has worked well for about 5 months but now it has started misfiring and shooting 2 or 3 on single shot, and often dribbling out of the gun inaccurately.

The only time I have none of these problems is if I hold the gun dead still.

Does anyone know any troubleshooting methods to help me?

Thanks
Tom