WAN port flapping on TZ270 connecting to Cable Modem
I have a client running a TZ270 Firmware 7.0.1-5030-R2007 that is having the WAN port going down for a few seconds and then back up. This started several months ago after it had been working OK for about 3 months. I have replaced the CAT6 cable between the Cable modem and SonicWALL X1. I have tried X2 as the WAN port on the SonicWALL. I have had the ISP (Shaw Cable) Replace the modem but the issues persists. I was running an earlier version of the firmware before the issues started and upgrade to the latest version after the issue began during my troubleshooting process. I have taken the SonicWALL to my office and connected it to my network and do not see the same issues. I have tried SonicWALL tech support but they have been of no help. Any suggestions or ideas would be greatly appreciated. I have this same model working at other clients sites connected to the same kind of modem with the same ISP with no issues.