Just to make sure you didn’t misinterpret the message:
The service detail includes multiple parts. The service as a whole is in state CRIT, but you need to check in the status detail to see which part actually causes this. Inside the status detail, a “WARN” or “CRIT” tag is shown directly after the relevant part.
In your case, the problem is not the “no unmonitored services” you had mentioned in this topic subject, but the SNMP timeout. I have edited the topic subject accordingly.
Cheers
Martin