Do all Grados eventually get grattle?

Been a while since I posted.

My Grado Sr125 developed grattle in one driver, and I put them in their case and in storage for a few years. I found a grattle fix on Headwize (suck & heat & clean) and decided to try it. The worst of the grattle is gone, but turning up an SR-71 amp to about 3/4 of then way brings the grattle back. My Beyers can take full volume without distorting. I was using Bink Audio Test CD 80kz "wobble" track. I also used the sine sweep and noticed that the drivers were wildly unmatched in the higher registers. It was like someone was turning the pan button. My Beyers were almost ruler-even all the way up.

Here is a weird thing: when I turn off the source the Grados are silent. When I turn off the amp, I hear a crinkle in both drivers like the mylar is deflating. Note, this is without music playing.

So why not just use the Beyers (DT250-250)? I love them but the Grados are just more musical.

I would like to get a new pair of Grados but at this price point, I don't want to end up with another expensive dud. I have my eye on the SR225.  My Sr125 are I think are pushing 7 or 8 years old.

Thanks! I've sucked and hit it with the hairdryer for about 5 seconds at 3 inches away.

I noticed the drivers sort of float in the cans.Can I pop the drivers out of the back of the case? It seemed like I could.

Besides, I don't feel like spending $200 on headphones I'll have to take apart and repair in 10 years or sooner or pay Grado $100 to repair them. I'd rather have working cans at this point without tape etc on the drivers.

The drivers are loose behind the plastic tabs. Should they be glued into place? If so, they would explain the rattle at low frequencies.

What kind of alarms me and makes me wonder the most is the loud crinkle after I turn the amp off. What the heck is that?