Can't reach to my NAS every time I reboot

[Gremlin]

"No route to host" is a network issue (as it implies). Maybe cabling? Or, as earlier the ip address has been reset so it appears to be on another (unreachable) network.

Have you scanned for TNAS with the TNAS PC app or Mobile App (with appropriate version upgrade)?

Do you have a means to scan the network to see what is active? (I find 'WifiMan' on my android tablet quite useful - and it's free)