Front Blower doesnt work

1995 Pontiac Transport 3.8 motor, took van for a spin last nite, blower worked great, an hour later the blower would not work at all. Started van this morning, now blower works again, any ideas???

I also have a 95 and have found 2 areas problematic. First, the high speed relay tends to burn up rather quickly. Unplug it ( it is on the firewall beside the blower) and check for a burned red wire. Second things I am presently having same symtoms. If you turn blower on and nothing happens, wiggle the connector going to the blower itself. Mine was giving a bit of a crack, then blower would function..am in the process of changing it out now.
Jeff