Error adding or removing product to cart with JS BUY SKD, version 2022-07

[OllyScanlon]

When a user tries to remove or add additional quantity of any product to the cart ( https://www.soundbrenner.com) we are getting the following error message in the console:

"Uncaught (in promise) Error: [{"message":"Internal error. Looks like something went wrong on our end.\nRequest ID: 1584fc6b-c609-4115-ba9f-bf818bf1a386 (include this in support requests).","extensions":{"code":"INTERNAL_SERVER_ERROR","requestId":"1584fc6b-c609-4115-ba9f-bf818bf1a386"}}]
at index.umd.min.js:26:32144"

Request being sent: client.checkout.removeLineItems(checkoutId, lineItemIds).then((checkout)

This has worked for us for years. Seems to be an error on Shopify's side. Any help would be much appreciated.

[RococoDigital]

Also seeing this all of a sudden but only when an offer has been applied to the checkout. When the user returns to the cart and tries to modify lineitems.