Accused of Reckless Driving

He lost his job. He's fighting domestic violence allegations -- and now, Derrius Guice has been ordered to appear in court over a reckless driving incident.

TMZ Sports has learned ... the ex-Washington Football Team running back was popped going 95 in a 55 near Dulles Airport back in June -- the latest in a string of speeding incidents in Virginia.

He was cited for misdemeanor reckless driving and a court date has been set for Sept.

Normally, this isn't a big deal ... but for Guice, it's another strike against a once-promising NFL star battling to keep his career.

As previously reported, Guice was arrested earlier this month on several serious domestic violence-related charges ... including…