Some Apps won't connect to the internet

Dear All:
I am having some strange behavior. Some of my Apps will not connect to the internet, while others have no problem. Sometimes this happens for a few days and then things are all right, and then it starts again.
Today, for example, the Google Mail App, says that it can't connect to the internet and to retry. Retrying doesn't help. I removed and reinstalled the App and it didn't help.
If I go to gmail.com on Safari, I have no problem.
There are other Apps like this, that won't work from the desktop, but do work from Safari.
So I assume that there is some different way Safari and Apps go to the internet. I have no firewalls on my modem.
If anyone has any suggestions, I would greatly appreciate hearing.
Thank you.

Try resetting your network settings.
Settings>Genenal>Reset>Reset Network Settings.

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Thanks for using Apple Support Communities. Based on what you stated, it sounds like you have an internet connection but some apps are having trouble. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.
Restart or reset your iPhone, iPad, or iPod touch - Apple Support
Update the iOS software on your iPhone, iPad, and iPod touch - Apple Support
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