After some very odd behaviour on GUMICH sites we discovered that the registrar for GUMICH domains has reversed the settings we changed last year, meaning a whois query for the three sites shows canadawebhosting as the registered DNS entry.
I logged in to the system and changed the www pointer A record to point to 142.104.6.1 (because an A record apparently needs to be an IP address) - I did this for all the sites.

NOTE: in order to make the changes I *had to* remove an mx record for mail. The existing entries were:
mx1c11.megamailservers.com.
mx2c11.megamailservers.com.
mx3c11.megamailservers.com.