"Invalid payment request" on Register

[milkdemcows]

This is the second day now where we are regularly, but not always - maybe 1 in 3 transactions? - getting a red "invalid payment request" window pop up when trying to complete a sale. This is on a maybe 2 year old 1st gen but V2 Register. 
- it doesn't matter the payment type; cash and credit are all affected

- it doesn't matter if it is a new transaction or a saved ticket

Tried a full factory reinstall and update, this did not solve the issue. 
I was able to open a failed ticket on my iPhone, and process payment there, and the payment went through, so it doesn't seem to be a global issue with our account

Edit: had a chat with Square support. They had me initiate a warranty replacement, deeming it a hardware issue.

[SVLFever]

Thanks for updating the thread @milkdemcows .  I was going to recommend swapping out the customer facing display with another one (assuming you had one), as it also sounds like some strange hardware issue to me too.

Glad you are getting this resolved!