SoundCore Boost loosing AUX connection

We have several ANKER speakers, 2 pieces of the SoundCore2 and now one SoundCore Boost. We love them for the great price and quality.

But the SoundCore Boost behaves differently in one point. I often use the speakers via AUX for having better TV-Sound or as PC-Speaker. The SoundCore2 always works like this for the case it is plugged in and turned on.
The SoundCore Boost is sometimes turned on, but not playing from AUX. I always need to re-plug the AUX connection to get it working. This is a big disadvantage when having it connected to a TV for days and I often need to re-plug it. Can you confirm that? Any reason for this design change?