Just found out on another forum that there is a Google task manager accessed with right click on the top bar. It shows all instances of chrome.exe and what they are open for, ie Flash etc. That is that explained, but not the memory availability loss. I will close this thread and perhaps re-post if further tests don't point me to the culprit.
Best Android apps 2015/2016: Best apps for your new phone or tablet - what apps should I download?