We have a network using Office365 with Outlook 2013. Each user on the network is having intermittent connectivity issues.
Outlook always says it's connected. We notice the issue when we try to send an e-mail and it just sits in the Outbox. We also do not receive any e-mails.
To fix, we shutdown Outlook, re-open, and the items in the Outbox are sent and we receive e-mail. Outlook will work for a few hours, even days, and then the issue returns. There is no way to know the issue is even happening until our sent e-mails start sticking in our outbox.
Any ideas? We passed all of the Outlook365 prerequisites on each of the PCs. The network is very small with less than 10 PCs and no server. Our firewall is a Cisco RV180 with a Cisco SG300 switch.