Relay - Doesn't work....at first
Make sure the relays are not counterfeit. I assume you've specified gold-plated contacts. Might be worth dissecting one from current production, though it would be difficult to test if the plating (assuming there is some) was thick enough.
But my fancy ratio tran$$$former box &quot;exercises&quot; the relays upon each power-up, so they are expecting trouble.
Generally gold-plated contacts are okay if you pass more than a few uA (10uA, say) &quot;wetting current&quot;.