CM1150V

What Firmware version is currently loaded?
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended. 
What is the brand and model of the host wifi router connected to the modem?

that was very minimal information. 

1. Did you check with your ISP?

2. Is this a new device? Did you get it provisioned from the ISP?

3. What are the leds on it doing? 

4. Are you able to log into it? 

Any more details you have helps. We're not psychic. We can't see what you've done or did. So the more you tell us about whats going on, what you've tried the more we can help.