How about this one:
ATC: Airliner123, say your heading.
Plane: Our heading is 185 degrees, Airliner123
ATC: Roger
.....5 minutes later......
ATC: Airliner123, no more heading restriction, direct to ATN.
This only happens in France as well........ever since I noticed this happening frequently I always wait 10 seconds and then ask: Confim you want us to maintain this heading?
Usually the answer is yes!
Or this one, after having been told to maintain our present heading ATC just says:
Airliner123, no more heading restriction.
So what now? Can I start making steep turns or fly direct to my destination or what???