Periodically, my Google Chrome home page (which I have originally set myself) changes spontaneously on opening the browser to display, instead, the page showing the rectangular small images of webpages I have visited before. In addition the bookmarks bar and my homepage icon has disappeared. I am also not directed to any other website location as might occur if a virus or malware were involved.

I can correct all of these changes back to my original settings the way I prefer (and nothing prevents my resetting it) and can continue to browse with no difficulty but this changed situation has happened several times in the past month. I had assumed that this was an idiosyncrasy of how Chrome (mis)behaves but worry whether virus or malware might be involved. I have monitoring by antiviral and antimalware software and run periodic complete scans and occasionally these find Trojans and other malware which are removed but this browser behavior seems to recur

I would like to prevent the surprises

Thank you.