Hi, RocketNerd!
The system maintenance screen occurs when the SYNC module determines the current amount of "data usage" is degrading its performance, and a reboot will re-optimize the system.
Some people may experience the reboot every day, whereas, others may never see it. It also depends on several factors, such as:
• If you have the Navigation option and how much you use it.
• How many devices you plug in on a daily basis (i.e. iPod, MP3 player, cell phone, etc.).
• Which version of software you have on your MFT.
• Which cell phone/carrier you have and how many applications you have running in the background.
I hope that helps!
Rebecca