Timeout exceed 2000ms

One of our fmbetterforms site experienced this error intermittently since this early morning. My the other custom domain site is working fine.

It worked well for a few hours this morning and then same problem ( > 2000 ms) happened the whole afternoon. Users are getting very frustrated. Here is the sever info from the Helper file. May be the server is having problem. Please help. TQ

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The error now has changed from > 2000 ms to authentication timed out.

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After a couple of hours, tt is now working as normal. Thank you