Comment 6 for bug 1831629

I experienced a similar problem, with constant disk writing at low rate (few hundred KB/s) and after inspecting the snapd process running on a container we found the following:

root@focal:/# snap changes
ID Status Spawn Ready Summary
234 Doing 2 days ago, at 16:40 UTC - Auto-refresh snap "snapd"

root@focal:/# snap change 234
Status Spawn Ready Summary
Done 2 days ago, at 16:40 UTC 2 days ago, at 16:40 UTC Ensure prerequisites for "snapd" are available
Doing 2 days ago, at 16:40 UTC - Download snap "snapd" (8008) from channel "latest/edge" (8.71%)
Do 2 days ago, at 16:40 UTC - Fetch and check assertions for snap "snapd" (8008)
Do 2 days ago, at 16:40 UTC - Mount snap "snapd" (8008)
Do 2 days ago, at 16:40 UTC - Run pre-refresh hook of "snapd" snap if present
Do 2 days ago, at 16:40 UTC - Stop snap "snapd" services
Do 2 days ago, at 16:40 UTC - Remove aliases for snap "snapd"
Do 2 days ago, at 16:40 UTC - Make current revision for snap "snapd" unavailable
Do 2 days ago, at 16:40 UTC - Copy snap "snapd" data
Do 2 days ago, at 16:40 UTC - Setup snap "snapd" (8008) security profiles
Do 2 days ago, at 16:40 UTC - Make snap "snapd" (8008) available to the system
Do 2 days ago, at 16:40 UTC - Automatically connect eligible plugs and slots of snap "snapd"
Do 2 days ago, at 16:40 UTC - Set automatic aliases for snap "snapd"
Do 2 days ago, at 16:40 UTC - Setup snap "snapd" aliases
Do 2 days ago, at 16:40 UTC - Run post-refresh hook of "snapd" snap if present
Do 2 days ago, at 16:40 UTC - Start snap "snapd" (8008) services
Do 2 days ago, at 16:40 UTC - Remove data for snap "snapd" (7988)
Do 2 days ago, at 16:40 UTC - Remove snap "snapd" (7988) from the system
Do 2 days ago, at 16:40 UTC - Clean up "snapd" (8008) install
Do 2 days ago, at 16:40 UTC - Run health check of "snapd" snap
Doing 2 days ago, at 16:40 UTC - Consider re-refresh of "snapd"

The download is stalled at 8.71%. It's worth noting that I experienced connectivity issues two days ago and snap downloads were affected and they were very slow for a couple of hours before getting back to normal.