Comms lost every so often

[dj]

We have a Smart-UPS 1500 that keeps getting comms lost every so often and would come back up. We have tried replacing the ethernet cable, using another port on the switch, reset the network config by pressing and hold the Audio Button and Menu button on the front panel of the Smart-UPS 1500 for about 5-10 seconds and we also press and hold the hole in the back near the network port with a Pin to reset the network. The same issue still happens. 

We would like to know what else we can try because we get a lot of alerts that this UPS lost comms. 

Please let us know and thank you 

[Teken]

When did this first start and what is the frequency of the error? Is the unit connected to a computer system via USB? Are there any active faults / errors present via USB?

Please upload the (Event & Data) logs from the NMC for review. What is the current activity / state / colour of the NMC LED’s?

What specific model NMC is installed and firmware present?

Lastly, please review the APC NMC User Manual as it relates to the (Watch Dog) timer and when it will be invoked.