Here are some trouble shooting steps:
1.I would suggest to clear cache both in PUBG app and system wide.
2.You can try to reset your Network, for that go to:
Settings>System>Reset options>Reset Wi-Fi, mobile & Bluetooth
3.Also reset app preferences.
4.If still you encountered the same issue after trying previous steps then you can try to "Factory Reset" your device.
Settings>System>Reset options>Erase all data(factory reset)
*Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.