Sander disc guidance please.

I'm using a 5" Bosch electric DA that I really like, in ignorance I admit .
The discs won't stick, the original loop pad lasted for years, then wore out, disc wouldn't stick regardless of clean etc, bought a new adhesive loop disc for old pad, lasted about 10 discs, disintegrated, bought a whole new Bosch pad, after about 10 discs, it won't hold them.
How do I get a disc to stick to this DA, or what's the best alternative electric .
Thank-you