Be very careful using semiconductor relays. The type you are using is designed to switch AC loads only. If you try and use it to switch DC loads it will probably turn on, but may not turn off because the current does not go through zero. The other thing to bear in mind is that all relays have a minimum switching current. For the part you are using it is specified at 150mA RMS. Are you sure your drivers are taking this much current. When selecting a relay try to not over spec it, you are using a 25A relay to maybe switch 0.04A.