Hi, Shopify said earlier they were having problems with google tags manager earlier on for checkout but not sure they said they fix it. Try turning it off and check with your client and let us know, thanks!
Topic summary
Main issue: Customers intermittently receive the error “There was a problem with our checkout. Refresh this page or try again in a few minutes” when moving from Cart to checkout. It occurs at or just before the email/address step and has been reported on Safari (older Mac, iPhone—sometimes after iOS updates) and Android; switching to Chrome sometimes works.
Initial guidance: Shopify Support requested context and suggested local troubleshooting (clear cache/cookies, incognito/private mode, disable extensions, try different browser/device, use Shopify app). Domain settings were reviewed; no definitive cause found.
Platform update: Shopify acknowledged a broader incident affecting admin and checkout and stated it was resolved, advising cache/cookie clears. Some users confirmed recovery.
Ongoing reports: Multiple merchants still see intermittent failures days to months later, with lost sales and inconsistent behavior (works one day, fails the next). Status page shows no current incident; Support advises opening authenticated tickets for backend investigation.
Workarounds noted: Clearing cache/cookies and switching browsers help some. For Android WebView (the embedded browser engine used by Android apps), enabling domStorageEnabled=true alongside javaScriptEnabled helped one developer.
Status: Partially resolved; recurring for a subset of stores. Root cause and a permanent fix have not been communicated; investigation appears ongoing. Screenshots are central to understanding the issue.