I am running HAOS on Raspberry Pi 4 2Gb with 250GB ADATA SSD.
The only solution is either for rpi 4 to wait for the system to come back from Hangup or physically restart the rpi4.
Curious about this as I have had this on my pi3b+ and I have since placed the pi on a wifi plug to be able to restart the pi remotely.
I have the same setup until I need the smart plug somewhere else. For me, it only happens with ADATA SSD, with sandisk SD card everything was working fine, the only issue was space just 32Gb.