I also had a problem with recaptcha the last 2 days. Now i switched browser to see if it makes any difference and it actually does!
With google chrome browser i had a lot of problems and after switching to internet explorer it worked fine again.
Me also, switched over to Firefox new 52.50 and now works a lot better, previously had to try and solve at ten attempts or more.
Even though i was getting them correct, it really was getting me down.
I know have to import all my bookmarks, and then try update my passwords for some sites, but however switching over worked.