Cubase 8.5 - CPU Drop-outs and spikes and more

Mine has now been hit and miss. Sometimes I click in the middle of a project and hit play and it takes a couple of seconds before the audio plays and a couple of seconds for it to stop playing. Some other sessions work fine. I’d be happy to run a debug version if that would help as this is frustrating as hell.
Is it my imagination or has Steinberg’s software been more buggy since Yamaha took over?