I've got exactly the same problem.
Wireless signal drops and even when I put my modem and laptop on the table few centimeters apart from each other the issue was still there.
I tried:
1. replacing the modem
2. buying a router and switching modem to a bridge mode
3. resetting/rebooting modem
4. shutting off all other wireless devices including bluetooth and home wireless phone
5. using different laptops
6. positioning modem at different angles
7. changing wifi channels
8.calling Rogers technitian to move cable to another spot
9. calling Rogers support
10. banging head against a wall
11. torturing voodoo doll of the modem's designer (scratch that)
None of that helped.
Connection is still horrible. Rogers support was polite but useless.
Replacing CIsco DPC3825 to a more expensive device after buying Asus router doesn't seem like a good idea.
Gonna try hard wiring house with CAT6 ethernet and using wifi just for ipads that suck anyway..
Never had that problem with 5-years old Primus router. Too bad I've got exclusive Rogers service in my area. 