Cannot verify server identity

I recommend try these methods

• Method 1: Restart Your Device
• Method 2: Quit And Restart The Mail App
• Method 3: Reset Network Settings
• Method 4: Delete Your Mail Account, And Then Add The Mail Account Again
• Method 5: Reset All Settings
• Method 6: Disable SSL
• Method 7: Repair iOS System

I get the same notification pop up on my whole screen about 3 times a day saying ‘Cannot verify server identity The identity of "google.com" cannot be verified . Review the certificate details to continue.’ and when i go onto the details and it shows localhost issued by ospanel. how to fix this problem?