E30 Hot start problem

[snowbound]

My 1986 325es will not start sometimes when the outside temp passes 80. When I turn the key all the electrical works and I can hear the fuel pump but the starter doesn't turn. I can jump the terminals on the starter and it will fire right up. The problem does not always appear but seems to be happening more often. Any ideas?

[zzpza]

sounds like the solenoid in the starter motor is failing.

j.