Google TTS over Home Mini stops working after a while

After a while (seems like when I have issued a lot of Assistant commands to my Google Mini), it stops speaking when I use the openHAB 2.4.0 say command.

To fix this, I have to change the volume to something else and back, essentially doing this before a say command (my standard volume is 50):

BTW, the volume was displayed as 50 in PaperUI when it happened, so it is not that the volume was 0 or something.

I am doing this now before each say command, but the downside is, that it always does a “blob” sound.

Anyone else seeing this and maybe have another/better fix?