Multiroom Sonos system. Living Room group has Sonos Amp wired to Mirage tower speakers through speaker outputs and a Rogers Soundlab Sub connected via Sonos sub out jack. Crossover frequency set with app Amp system settings to 65 Hz. Connected wirelessly to home network and other Sonos products on home network. Every couple days I find the crossover setting is back at the 80Hz without having made an adjustment to desired crossover frequency. Is there some situation such as changing speaker grouping through the app, or perhaps transient loss of network connection or power related event that I am unaware of that prompts the Sonos Amp to do this reset to default? Other settings for the Amp remain as set. All components in this group function normally and connection is functional for connection to other groups in system, just this inconvenience.