Rogers firmware update to hitron CODA-4582 causing issues?

Experiencing weird issues. Rogers may have rolled a firmware update to hitron CODA-4582 modems that degrades ping replies to gateway ip - most pings do not get a reply. Happened over a week. 

This affects pfsense gateway monitoring feature. Disable gateway monitoring to fix pfsense. If you don't make the change your router/internet will work but you will get dropped packets when pfsense thinks it has lost internet. This creates problems with voip/zoom calls. 

After investigating further only pings coming from the router(behind firewall) are not replied consistently. All external pings to modem work properly after testing for a 12 hours. I have swapped out router with previous known working router and are different firmware versions than the router in question. So far not a router/cabling issue. Any Rogers customers experiencing similar issues out there?