Quicktime Player (Version 10.5 ) not functioning properly
I running macOS Mojave 10.14.6 and have the above version of QuickTime player pre installed, however my problem is that I have one hour screen videos that I'm recording and I sit and wait for the video to get to the end so I can stop the recording then it brings up my recording and I discover that its only recorded the first five minutes or ten if I'm lucky this is a continued problem which is now driving me nuts.
What is going wrong and before its mentioned the sleep/nap settings are all set to never etc...
Please help, my iMac is also only five months old so before I throw the **** thing out of the window and totally give up on Apple products can someone please help me?
Thanks in advance