ARRIS DG1670A question about this modem :)

so this is the deal going on at home...we have a total of 23 devices that feed of the modem, lately its been randomly crashing,signal is weak and short range. once i reset it works fine again for about 2 hours(yes i know i have to buy a new modem) i cant afford to buy a new modem at the moment :/ any way i can mod my modem? im a noob at this.. i just found this sweet bitchin site thank you for taking time to read my thread have a good one folks