Xfi modem restarts on its own often

Lately, as in the past couple of weeks, our xfi modem has started to restart itself as if it is being unplugged. This has been happening almost twice every 30 min to an hour randomly. I am at a loss because nothing has changed since it was installed over 2 years ago. It needs to be fixed because we work from home and if it keeps cutting out due to this problem that is unacceptable. Please help