Connection problems

Hello All
We have 4 devices installed at Tempi tunnels. At the device named TEMPH_TUNNEL_1_SOUTH it gets offline (as you can see in the csv file sent) for about 6-10 minutes everyday. At this moment the device indicates that it is online but the services (http, admin panel and SSH) are offline or disconnected. Also the device named TEMPH_TUNNEL_3_NORTH it is right now offline but we can access the services.