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FP3 Touchscreen doesn't respond after opening app

hi forum,
since this morning, my FP3 troubles me with the following issue: when using the phone the screen suddenly froze and the touchscreen didn’t react any more. After re-start, the touchscreen worked again, but only for one or two steps. After unlocking, when opening the preferences or any app, the touchscreen again didn’t react any more.
Neither safe mode, nor reset to factory status nor a cleaning of the display module resolved the issue.
I am not sure whether this is a software or a hardware problem. The fact that the touchscreen works to unlock the phone and select an app, and after opening the app it doesn’t work anymore tells me it is a software problem. But then I don’t know why a reset to factory does’t help either.
Does anyone else face this problem?

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