Hello there,
I have the exact same problem, I can barely hear when the antenna switch from Float to Fix and the reverse, although the sound volume is set to maximum in the settings.
When I select the volume level in the settings, I can hear the volume indication beep loud and clear so it is not a hardware problem (the speaker), it’s a software one.
According to me it’s not related to the 26 beta 1 firmware. I have experienced this problem for weeks now, well before the 26 beta 1 firmware release.
Would love to get a fix for this problem.
Have a nice day!