Need to check modem warranty, software update, intermittent connection on modem

Hello colscuba1

                            SB6141 is just a cable modem without inbuilt WIFI so yes we hope you have connected separate router to the modem to access WIFI. To check the modem warranty you can reach out to arris.com/consumersupport and about the software or firmware updates ,The Cable Operators (MSOs) have complete control of what cable modem/gateway hardware they will allow installed and the firmware it uses, this is because they own the coaxial cable that is connected to the ARRIS SB6141, because of that the Firmware updates are pushed by them, and any update needed as well. Any associated firmware updates are automatically deployed by the cable operator. This is not an ARRIS only implementation, but the required implementation of any cable device manufacturer. Even for the device owned by the customers since the modem is activated by the Internet service provider you need to check for software update with your ISP. 

  To confirm whether the issue is with the router connection or else with the modem we need to check the modem cable signal level, so on direct connection without router please follow the steps mentioned on the link below

                    http://arris.force.com/consumers/articles/General_FAQs/SB6141-Cable-Signal-Level

Let us know if this helps.