Disappearing Modem Event Logs

I've been experiencing intermittent T3 timeouts starting this month (which is not what this post is about). Since my modem was
about 10 years old I replaced it with a new Motorola MB7621. I'm still seeing the timeouts "Started Unicast Maintenance Ranging - No Response received", etc in the modem event log, which I kind of expected.

But here's the issue, I never seen more than one or two messages in the event log at a time. Whenever I look, if a new message appears any older message will have disappeared.

The modem is not getting power cycled, the uptime is not reset. I am not clearing the logs.