I've just updated and first thing I check has stopped working. It's an HP EliteBook 820 G2 and I updated from Impish 21.10. Can anyone suggest fixes or troubleshooting?

I tried editing the settings to toggle scrolling and tap to click on and off. I rebooted afterwards. No joy.

Edit 20220515 (morning): I just turned my laptop on again for the first time since originally posting this and both functions are working. No idea why. I haven't changed anything. Maybe it just needed a rest after the update. (:

Edit 20220515 (evening): The problem is back again! Totally unpredictable and won't be remedied by reboots. I run Unity and switching between that and GNOME does nothing. Very, very annoying. If I log in to GNOME Classic then two finger scrolling suddenly works but tap to click doesn't. I can turn scrolling off in settings and it stops working. It only starts again if, after I turn it back, I also toggle tap to click! This is cray.