Are they connected differently (wired vs. WLAN), using different OS versions, …?
Both connect through WLAN (like myself), One has the same OS version to me while the other has a different OS version. I have "Windows 7 Home Premuim, 64-bit OS", The others have "Windows 7 Home Premuim, 32-Bit OS" and lastly the other has "Window 8 64-Bit OS".
What is the modem log reporting when this occurs ?
Read from bottom upwards, Bold and Underlined
writing is my notes