System Tampered!

I've only had my Yoco machine for 6 months and all of a sudden it displays "System Tampered". I've tried switching it off and on for a while not but the same error appears "system tampered". I now go to the Yoco website and find they indicate when this error appears your basically done with and need to replace at your cost. My business and customers are dependant on these card transactions...This is extremely disappointing...