I am thinking this is the mounting getting a little loose on the regulator assembly? As if the window is canting backwards and dragging against the run.

The glass run (window seal) is new, replaced 18 months ago, and lubed with Sil-Glyde, so I am thinking it must be the regulator mounting. Is there a DIY somewhere on getting the door apart and adjusting it? I have searched without effective result. Or has someone BTDT and can share some pointers? Thanks!