On my 2009 Jaguar XKR convertible drivers side electric seat, the electric controls on the door stopped working while the passenger side works fine.

I got out of the car, and when re-entering I could not adjust the driver seat seat, while the passenger side works fine.

Could this be a problem with the remote key?

Any advice?

Got it........

Seat memory somehow reset itself after being locked for about 30 minutes.

These cars do have some weird gremlins - a couple of days ago, mine wouldn't let me put the park brake on. Locked it, came back later - park brake works fine.