We’re sorry to hear the issue came back. Since both your old switch and the new one have failed in the same way, this means the problem is likely not coming from the switch itself, but from another component in your chair’s system. This could include the control box, wiring, or the power supply. Once that underlying issue is resolved, the new switches you will buy will not burn anymore.
We understand your frustration, but we highly doubt we are the culprits here.
Please contact us so we can guide you through the next steps to get your chair functioning reliably again.