Slow DSL and LTE speeds

I live in Mittelbrunn and have had o2 for nearly 8 months. We’ve had fantastic cell phone signal and internet the entire time. It has worked out well, because even in the areas of our house that the Wi-Fi doesn’t reach, the LTE speeds are fast enough to continue our internet access. 
 

in the last few days though, everything seems to have slowed. Streaming on Wi-Fi to my tv, which used to be no problem, now is nearly impossible without constant buffering. And even though I have full Bars of LTE signal on my cellphone, accessing even this website takes forever. 
 

i was curious if there is some construction or some issue in my area to explain the slow speeds and when any resolution could be expected. 

Edit o2_Sven 07.09.2022/07:47: Moved thread from the Wohnzimmer to English o2 Community: Mobile