iPad seems to freeze when exporting file
So I have this problem 2-3 days now
when I am going to export a file (all are .pdf file, range from <1 MB to 30 MB) from drive, LINE, or Microsoft teams, there will be no export menu popup and will softlock in the pdf viewer; I can still scroll through the document, write it with apple pencil, but I cannot close the viewer/change the app/swap up to see latest app usage/press the notification to go to different app. the only solution I can do is restart the iPad, sometimes I can just shutdown it or force restart (press the volume button 2 times and hold lock botton until it reset) then I can export the file, but after using it for hours, it will eventually struck again.
It will be much appreciated If you have any solution for this, also for the alarm clock too
current iPad OS: 17.4.1 (up to date at the time posting), storage 131.52/256 GB used
iPad Pro (4th generation)