[Galaxy Tab S2 Q&A, Help & Troubleshooting] stefer09:
Hello, I hope I can post this here.. i tried, i searched... can't find any solution to my issue.

Model : SM-T810 , with Samsung 128GB UHS microSD. OS : stock Nougat from Samsung.

Here is the problem :

On the play store, if there are pending updates, they only install one at a time, and then it won't do more. Like if there is 5 pending updates, it will maybe do one, and then the other 4 stay pending. It might only do the download portion of the first one and not go to the install phase. If there's no pending updates, and i try to install an app, only the downloading portion of the process shows up, it stops after that, it doesn't go to installing. I have to close the store and go back in for it to install, but if there's a queue of downloads (updates or asked to install multiple apps), I have to close the store for the same amount of apps in the queue for them to install one by one. Now I noticed that every once and a while, 2 or 3 will have updated overnight but that's it!

I closed the process, I cleared the cache, I cleared the data, I cleared the download manager's data and cache, i rebooted, i forced a wrong date and time then set it to auto-date and time to retry, etc.... I uninstalled the Play Store updates, nothing worked!!!

The next step was to do a factory reset. I did not want to lose some progress on some games, AND I have an app to read PDF files and did not want to lose read/unread status of my files...

So I used Odin to flash TWRP, did a backup, rooted, used Titanium Backup to backup my apps.

Then I did factory reset. Store behaved normally again! Installed a few apps, waited a few hours, still good. Did a restore of my apps from titanium backup, everything seemed fine, then a few hours later, store still was not updating or installing the apps right...

Did another factory reset, store worked fine, only restored a couple of backed up apps (the critical ones that i wanted to keep the saves from), everything worked fine. Over the course of 24 hrs, i re-installed a bunch of my regular apps via the play store. Play store worked fine. I did to another Nandroid backup with TWRP just in case.

Then all of a sudden, it started to lag a bit between clicking install, to downloading, to installing. And then a few hours later, issue completely came back, store won't install without me closing it between the download finish and install.

Now one of the last steps I did before it started acting up again was moving ONE app to the SD card (not using any root features). I'm not sure if that caused the issue to come back.

I did notice that Android left a bunch of files on my SD card, some Android folder, with a bunch of subfolders.

I'm wondering if the SD card could be the culprit... I will do one last restore from my last working Nandroid backup and not move anything to the SD card.

If it comes up again, i think i will move the data that i have on my SD card that I dont want to loose (my PDF, pictures, etc.) on to my NAS, and do a factory reset without the SD card installed. Maybe even re-flash with Samsung Kies... and forget about my Titanium Backup saves...

It's my last resort so I was hoping anyone would have any idea on what else to try before doing that?

One last point : yes the stores kinda slows down at some point where the download process takes a few seconds to kick in, and then a few seconds to installing, up to the point where it never does. BUT the rest of my tablet still is really fast, no slow downs anywhere else... All apps launch fast

Thanks!