Don't know if this will help anyone, but I noticed a flood of complaints regarding redirect loops starting a few days ago. I too had the same problem and had put it down to domain mapping which coincidentally had just been updated, however upon further investigation discovered the issue was actually with a recent yoast analytics update. Not sure of the ins and outs of it but it seemed to have some sort of front end authentication issue whereby users would be logged in on the backend but not the front end, which would also explain the loop because domain mapping is attempting to log users in but it keeps logging them out. downgraded it and all works fine now.
Hopefully someone finds this useful and hopefully yoast issues a fix soon.