S7 - WiFi quits working. Turning WiFi off then on fixes it

Every several hours I cannot get anything over the internet. Going to Tools-WiFi shows the phone is connected with strong signal and internet access is OK - but it isn't.

If I turn WiFi off and then back on, internet access is normal & I start getting emails, etc. from the time it was not working & all is well until it stops working again usually many hours later.

Other devices (including another S7) connected to the same WiFi network are not experiencing the problem.

Thanks for any help.

Energy Saving Mode ? any changes to Developers Settings ? Reset phone ?

Thanks for the suggestions.
Energy saving mode? - No
Developer's settings? - No
Reset phone? - Do you mean reset to factory settings & memory content? I'd rather try that only as a last resort.