I have been working with Ace Zafra at Trend Micro Support for a few weeks, trying to resolve my problem. He is working from their Head Office in Asia. I spent over 6 hours on the phone ( 3 days : 2hrs). He took control (remote) of my PC and did quite a few tests and collected data. So far, no luck: I still have the same problem. I have to stop Trend Micro Maximum Security if I want to go back to "normal".
At first, they thought it was an isolated problem with my PC : HP - All-in-One. But my wife.s PC, which is an older HP All-in-One PC, running on Windows 10 has the same issue/problem.
The last tests were made a few days ago and collected data sent to their technical team for a thorough analysis. Hopefully they will come back to me with good news. If not, I will seriously consider my next step: wait for a solution or choose a new provider!!!