Hello,
There was a problem with permalinks when viewing products, the links was showing 404 error. I’ve fixed it in Settings > Permalinks.
Concerning the Cart issue we recommend you to disable all 3rd-party plugins and clear the cache folder via FTP as you’re using cache plugin. Also please update Woocommerce plugin to the latest version.
If it doesn’t help please provide us with FTP credentials.
Thank you.
Regards,
Eva Kemp.