I've noticed that over time (a year or so)
our duct tape is drying out
and falling away from the heating ducts
that are located in the ceiling of our heated - but unfinished -
basement.
It is used to wrap the tubular joints
of some of our basement ducting
along with our clothes dryer vent ducting connection to the outside.

I can understand the heat from the duct is drying out the adhesive...
Any suggestions on this ?
I mean, isn't that what duck/duct tape is for;
sealing a tubular duct joint.