Hi @partapsing71580
Things to try to resolve the problem:
* [link|https://www.hardreset.info/devices/samsung/samsung-galaxy-m01-core/wipe-cache/|Wipe the cache partition] and check if that fixes it.
* Start the phone in [link|https://www.hardreset.info/devices/samsung/samsung-galaxy-m01-core/safe-mode/|safe mode] and check.
If it works OK when in safe mode, a ''downloaded app'' may be the cause of the problem. The trick is to find out which one. You will need to uninstall each ''downloaded app'' one by one and test the phone in normal mode between each uninstall, to check if it works OK or not. When it does the last ''downloaded app'' that was uninstalled was the culprit. A ''downloaded app'' is one that you downloaded and installed and wasn't already pre-installed on the phone when you got it.