If Thecus ID unstable please try on following suggestion:
1. Check the Thecus ID status, please visit following page. http://thecusid.thecuslink.com/mythecusid/
2. Thecus ID is a DDNS service too, and NAS ADMIN WEB inteeface support 3rd party DDNS too, thus you could choose other DDNS service to instead, as like NO-IP is a free DDNS service, since you configure completed and the application usage same with Thecus ID.
EX:
Thecus ID = xxxx.thecuslink.com
NO-IP DDNS = xxxx.ddns.net
=> http://xxxx.thecuslink.com:9800 = http://xxxx.ddns.net:9800
3. NAS would check & update Thecus ID every 10~20 mins. But according from network infrastructure, if your route have DDNS server support, here we recommend configure & use the DDNS from your route would be would be more effective & timely update, and rid off the gap about DDNS update.