I've had a similar problem which appeared to start last week. Raised a ticket last week with Support, currently waiting a response.
Running 8.8.1.8, balance doesn't refresh, markets don't start and I've needed to restart MFP to get things going again. No errors in the logs. I didn't spot the issue the other day and looking in the logs things starting working again about 2 hours later (ie with no intervention from me, nothing logged during those 2 hours).
I thought whether my broadband connection was glitching but I see no problems with it, yesterday I ran a ping in the background running every second and writing response + timestamp to file - when the hang happened on MFP I didn't see any problems with the ping responses. My other Betfair bots have also been working fine so I'm not sure what's going on?