Has it "always" behaved like this, or is it something that just "suddenly" started happening one day?
If the latter, then I'd be stopping my app service(s), getting a cup of coffee, then restarting my app service(s) to see if that fixed it. Since you are hosted, that would be something you'd have to ask the SAAS provider to do for you. And if that fixed it, I'd just put it down to experience and move on...
If the former, then I have no idea - sorry.