@Soumilinon -- has to be the XB7 modem
It could be a "signal strength" issue -- where the XB6 was more tolerant of such an issue than the XB7.
Contact Shaw, and get the Agent to remotely logon to your XB7, to view the "signal strength" reaching it.
Poor signal strength can be remediated:
- service technician cutting the ends off coaxial cables, and attaching new ends, both at the Shaw "Demarcation Box" on your building, and up the nearest telephone-pole;
- replacing the coaxial-cable between that box and the pole;
- replacing any "splitter" that is inside that box;
- like #1, for the wall-outlet that your cable-modem users;
- different coaxial-cable, from that wall-outlet into the cable-modem.
Probably not the XB7 at all.
