Internet allowing a few sites timing out others

I'm on my phone trying to get office internet back up and working.  Long story short, have a TZ190 firewall, content filter stopped working. Had sonic wall log in and update licenses.  So it was working.

Hopefully a coincidence but about three hours after this, internet started acting weird.   A few sites seem to work fine but most time out.  Also outside users can no longer hit out OWA site that is housed internally.  

Called ISP they say no issues, what could be causing this?  I turned the content filter off which sonic wall turned on thinking they messed something up but no luck there.   Very weird to me that traffic incoming is being blocked to?  And it's not a content filter block page its a website timed out page.

Sorry to be so brief but trying from phone while on phone with ISP
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Cris HannaSr IT Support EngineerCommented:
Have you rebooted your ISP device and firewall??
Lionel MMSmall Business IT ConsultantCommented:
iSP's are notorious for not admitting when they have problems. Can you ping and tracert their DNS servers--you can test using google's dns servers to see if it is an issue with your ISP's. Still I would turn off your ISP's devices (modems, routers, etc.) too as suggested.

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FosterThomasAuthor Commented:
It was on the ISP's end as far as I can tell, Ive never had an outage before where on speed it reads the correct MBPS but nothing works, we could get to google and google things but when you click the site it wouldn't come up and yahoo news worked randomly but 99% of all sites wouldn't work, it was just a very weird happening.
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