Thanks all, I did the upgrade and all is working!
Indeed I also confirmed with Qnap faq.....read me first! - Tips, Tricks & How-Tos - Plex Forum , it would be a bad idea to uninstall the current version, so I didn’t touch this.
After the new version I noticed the linux load spikes to 8 or 9 on my 4core and the system was basically unable to do anything. I left it alone overnight and now it’s all fine.
Again, thanks!