 Watch losing connection to iPhone while the iPhone is connected to car system

[MacInWin]

The subject line says it all. I have noticed that when my iPhone is connected by BT to my car system, streaming music and being used for navigation, my watch sometimes shows the red symbol saying it cannot find the iPhone. The two are about 3 feet apart, so it shouldn't be signal strength. I don't have the problem when the iPhone is download streaming music and I have BT earbuds going and the  Watch in the middle of an exercise routine, using a BT heart monitor through the  Watch, so I don't think it's a case of "too many devices" but I just don't know.

Anybody else see this? It just started recently, maybe after the most recent release, but I'm not sure of that.

[Raz0rEdge]

My Gen 3 watch doesn't disconnect from my iPhone 6S when connected to the car or otherwise. The only time it shows the red symbol is when I go for a walk and forget my phone. My watch is on watchOS 4.3.2 and iPhone is on iOS 11.4.1.