I have an Acurite 5-in-1 that’s 5 or 6 years old. I noticed that VIS reader has an option to email various status items including loss or acquisition of signal. Since turning on LOS and AOS I’ve been getting several sets of notifications a day at random times. Some last several seconds and others up to 5 minutes or so. Normally the signal shows 4 bars on the display. Is this typical? Early signs that the outside unit is dying?
replace the batteries?
My first thought but the display shows the batteries full. I might change them anyway just to see what happens.
Of course, it hasn’t happened at all today. 
Batteries in the unit test OK. New batteries didn’t help as it happened several times afterward.