If you just setup your RL-100, RL150 or RL-160, with the same WiFi name and password you have been using, and are experiencing unstable or slow WiFi, it is likely that there are two networks interfering with each other.
Here are a couple of things to check:
1) Did you turn off the wireless network on your modem? If not, contact your internet provider to help you or follow the instructions in the product manual of your router.
2) If you replaced a standalone router with an RL-100, RL-150 or RL-160 router, be sure that it is unplugged and no longer broadcasting.
If these don't help, please contact our Support team.