I tried the sound in OEM shipped version out of the box, then postmarketOS and then back to pureOS. Same results everytime, no sound from speakers no matter the settings. Waiting to see what support has to say.
I am in Canada for those interested.
You do also have the option to increase the autosave interval, at your own risk. (I haven’t yet tried LO on the Librem 5, due to no dock as yet, so I don’t know whether that is a reasonable risk.)