Android heavy lagging/freezing/desktopscreen moving left<->right [HELP] - Android Q&A, Help & Troubleshooting

Hello guys,
So, i have rooted my Device (BQ M5) 1 Month ago and installed Xposed on it. Everything was fine until yesterday, where i was underway and streaming via Chrome a video. I didn't close Chrome and simply locked my phone. Several minutes later, when I tried to unlock my phone, i directly noticed heavy lag (response 2seconds - 2min - locks device). I thought a reboot might solve this issue, but i was wrong. I started to uninstall several previously installed apps and tweaks (where the newest App/Tweak was 8 days "young".
After a reboot, still heavy lagging. I opened TWRP and Cleared Dalvik and Cache, did a reboot in System, Recovery and Bootloader. I even flashed the device with a complete fresh OS. The problem still remains. After several re-flashings, some cache clear, factory resets and SuperSu unrootement i somehow managed to get it to work again. So I started from 0 again, and installed all previous apps, and root apps. Everything was fine for several hours (connected to Wi-Fi), so i was installing Xposed again, with 2 apps/tweaks: Flat Style bar, youtube adaway. Everything was still allright untill i left the house. I unlocked my device 50min later (for the first time when i left my house) and boom, the lagging was back. (Don't have internet outside my house).
As soon as i came back, i retried everything to remove the lag, however I did now several things in addition for over 3h and the lagging sill remains. I down and upgraded the OS, formatted the data, did every clear in TWRP and Bootloaded that i could find. I reset it via Settings and flashing. I installed SuperSu and de-installed it.
I don't know what else i could do, to solve this issue. The lag remains when using TWRP, Bootloader, using the Device, or when the Booting animation of android appears (slow animation or with a "fps of 0,05").
Please help me!
Device: BQ M5
Had Android 5.1.1. on it and Installed xposed sdk22 arm, and installed SuperSu via TWRP.
All files were downloaded from official posts here on xda, or from the brands website.
p.s. Even the littlest information which could help, please share!
p.p.s Here's a video that shows whats going wrong. After the reboot the booting animation continues like this around 1-3min. and then at the unlock screen, the "lag" still remains. What i noticed too, is that the charging animation in the top right is running flawlessly, however opening apps and all the rest is really slow!
youtube(dot)com/watch?v=Htuhj8UzWs4

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