My wee baby Ford Ka '03 - the left signal sometimes wouldn't self cancel. Half of the time it cancels itself other half of time, it wouldn't. Right signal is all perfect.
I took the car to the garage to have a look. And of course, it behaved! They said they couldn't find anything wrong.
It sometimes work perfectly for couple of days then fail to self-cancel then resume working.
It's annoying me as I live in a town where roundabouts are everywhere!