I don't find much helpful info on my driver's side power seat at
Brickboard.com, so maybe somebody here can give me some advice.

The seat's electric control buttons were fully functional at all times from
the day I bought it new until a few weeks ago, when they became kind of
balky.

Now, when my wife drives the car and moves the seat all the way forward I
don't have any trouble moving the seat back before I try to sit down as long
as the car has cooled off a little since she parked it.  I can open the door
and run the seat base aft as far as I like.  Then I can sit down and close
the door and start the engine and it won't move any more.

This troubles me because sometimes my guesstimate is not accurate when I
first position the seat.  If I sit down and start it up and then find that I
really need a little more leg or belly room or maybe the seat back angle
isn't quite right, the seat won't move at all when I reach for the controls.

Actually Volvo's owner's manual encourages people NOT to move the seat when
the vehicle is in motion however despite all that, mine worked fine at all
times before this started happening, so I know it's not because the seat was
programmed at the factory not to move if the ignition is on.

Since the seat DOES move under some conditions there's apparently nothing
mechanical wrong with it but there must be some sort of electrical glitch.
Is this a common thing?  And what should a non-electrician such as myself
check first?

Pat