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Please post modem signal levels / diagnostics. Do not reset your modem/router for at least six hours before you gather this data.
How are you measuring these speeds? From a wireless device? From a wired PC?
Arris model SBG6972-AC no longer appears on Spectrum's list of approved modems. If you choose to keep using it, Spectrum won't spend any extra time helping you keep it alive. If you elect to upgrade your equipment I'd recommend buying a 16 x 4 or 24 x 4 modem and a separate router with Gigabit ethernet and at least 1900 Mbps AC WiFi.