Back minivan hatch is catching on something

And it's getting worse!

It's a 2001 T & C.

An audible pop or snap is heard as the door gets past this "invisible" path
on it's way to opening. Not so bad when closing, but now the automatic
liftgate will come back down due to the increased resistance.

I can't see anything on the door, hinges, gaskets, struts or frame that show
wear marks. Maybe the struts are misaligned?

Before I start taking stuff apart thought I'd check here first...

Just for clarification, the snap or pop or noise is heard when the liftgate
is about 85% closed.

Regards,

ng_reader