I've noticed many people got problem with connecting to EOS Token Distribution.
Anyone who has this problem with buying / claiming EOS via their website please be patient, there is problem with MetaMask overload.
Just be patient and then get your EOS.! Below information from EOS official Slack
" we are experiencing a high volume of requests to the token distribution interface on the website right now, which is overloading the metamask node. Looking to resolve the issue shortly."