Fixing? Perhaps, going back to 8.0? No. That requires a factory reset. For fixing is to start your phone in save mode and see if the issue occurs there (Hold the off button for a few seconds, wait until the menu with the options "Power off, Restart, Emercency" appears. Hold Power Off a few seconds until you get the save mode option. I really hope that this gets the menu working again (Even if only in save mode ). But its also a good way to give the system a nice kick. My personal experience was that the phone was slower for a short time after the update - But after a few days everything went smooth for me again (Some optimalisation is going on in the background). If that option doesn't resolve the menu issue - I would still recommend a factory reset.
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