Uninstalling and reinstalling the PIA VPN software can resolve a lot of issues with the VPN. Please use the following instructions to do so on your Android device:
Step 1: Go to Settings > Apps and locate "PIA VPN"
Step 2: Scroll down through the app detail, locate the Cache section, and click "Clear cache"
Step 3: Scroll back up and click "Uninstall"
Step 4: Reboot your device
Step 5: Install the PIA app again fresh from Google: https://play.google.com/store/apps/details?id=com.privateinternetaccess.android&hl=en