My Verizon Message+ app periodically stops syncing with my other devices. Internet connection is working. Also notice that Apple's app store link will not open. Upon rebooting my Netgear GS108T switch and Motorola cable modem Message+ and App Store begin to work. I am using default settings on switch. I have multiple access points (multiple buildings) and additional GS108T switches on my network. Any idea if this could be a modem issue, or a network settings issue? Any recommendations on how to gain more knowledge about how networks function so I might be able to understand the causes of these types of problems?