I would check the threads and if possible file a "leading edge" to the first thread on the pipe. This may help it screw correctly together.
Secondly, are the male and female threads the same. One might be metric one might be imperial of some fancy size only produced by the manufacturer.
It the female thread OK, check to see if the thread has started to "peel" away, Again I would pick out any thread you can see, if any.
Failing that, looks like your on your bike on monday....