Refunds from prior day happening, but no one is refunding

[JHBergman]

We have about 50 transactions from a prior day that all just got refunded for no apparent reason.

When I look at the details it says "accidental charge", but these are all valid sales that are refunding.  

Anyone seen this before?  I cant afford to lose basically a full days sales like this.

[JHBergman]

Great information!  Thank you.

Is there a way to block access to the system by device (phone) name?  This looks like this was malicious activity.

Do you know if it is possible to undo a refund?