Thanks FT for your support. The funny bit is that it didn't make a full factory reset, since that will delete everything in the phone. Apps, contacts etc. Just the icons disappeared on the splash screen. On all three pages. I really want to know what the heck I did that caused it.
I manually "restored" all app icons since they were still in the phone. No big deal really. The only icons that are missing are those shortcuts one can save to the splash screen directly from the browser.
Checked and no major update was made resently, latest was in February.