Must be an mweb thing..
My office365 struggles on the WIFI as well now.
Definitely mweb related have swopped routers and changed ISP used axxess, no dropping of the line observed.
Download speed Tests peaks at 10 then settles down to 9.67 Mbps same on upload peaks around 10 then settles down to 6.95 Mbps (axxess) & 6.70 Mbps (mweb).
In both speed was never affected but mweb would lose connection randomly, even when switching between isp axxess would connect and authenticate immediately where as mweb requires 2 or 3 tries when setting of the config before connecting.