The Maxx 2 comes with a 12 month warranty, and Verizon did not start selling it until last November, and it never had 4.4.4. Do you have the older Droid Maxx rather than the Maxx 2? (This is a forum for the Maxx 2, not the original Droid Maxx.)
One possibility: on your home network, you may be having channel interference or something similar. Try changing your router to a different channel (most people use channel 1, 6, and 11 on a 2.4 GHz network, because a WiFi channel actually spans about 5 channels. If it is 5.4 GHz, you can use just about anything.)
If you are using WPA/TKIP for security, try changing to WPA2/AES. (If you are using WEP, DEFINITELY try changing to WPA2).
Neither of these things will affect your other devices - they will see the change and automatically reconnect. (Also, sometimes restarting the WiFi access point/router will help.)
If you have Bluetooth turned on, try toggling it off to see if that is interfering.