New Jellyfin Server/Web release: 10.11.3

[comboy]

ok - i have massive problems since 10.11.0

android tv app always crashing and everything sluggish.
11.3 seems to have finally fixed the app, as i was able to show movie/show lists without the app instantly freezing and crashing.

still sluggish and lots of errors in the log.
scan all freezing at 57% or not starting at all and hanging at 0%

so I started with a fresh 11.3 install

let it scan in all movies/shows no problems. blazing fast again and seemingly no grave errors in the log.

added my music library - initial scan took forever but ran through without errors.

when I now start "search for missing metadata" on the music library jellyfin crashes and reboots 
edit:
did some digging
- crash log has

Code:

in
[*]MediaBrowser.Controller.Entities.Folder.ValidateChildrenInternal

and

Code:

MusicArtist.ValidateChildrenInternal
.
[*]LimitedConcurrencyLibraryScheduler.Enqueue"

[*]
and

Code:

"System.ObjectDisposedException: Cannot access a disposed object.

Object name: 'IServiceProvider'."

- deactivating musicbrainz did nothing
- setting "parallel library scans" to "1" seems to fix it (at least I'm currently at 54% scanned and no crash after the first single digit % scanned)
- I'm also getting lot's of Auth errors:

Code:

"[font=monospace][color=#000000][10:07:50] [INF] [32] Jellyfin.Api.Auth.CustomAuthenticationHandler: CustomAuthentication was not authenticated. Failure me[/color]
ssage: Invalid token.
[10:07:50] [INF] [32] Jellyfin.Api.Auth.CustomAuthenticationHandler: CustomAuthentication was not authenticated. Failure me
ssage: Invalid token.
[10:07:50] [INF] [32] Jellyfin.Api.Auth.CustomAuthenticationHandler: AuthenticationScheme: CustomAuthentication was challen
ged.
"[/font]