Views drops massively after 2 hours

I have been doing well on tiktok with views coming anywhere from 200k to 5million with one even hitting 7 million views. My average is 600k views with some videos hitting 1million in between. It is rare that i hit just 100k. However this has changed recently. Just two weeks back, I started promoting a company by displaying a banner in my video. It showed their email, phone number and company name. The videos did well initially but then it suddenly started dropping hard with most of the videos getting around 150k views only. I guessed tiktok did not like me promoting a brand so i stopped putting it on my videos hoping things will start improving. However, nothing improved. My videos dont seem to climb pass 200k mark at all which is strange for me. When i looked into my analytics, i found that all these videos have one thing in common. It drops hard after 2hours. It might get 25k views first hour and 25k second hour but after that maybe 5k views and keeps dropping or stays flat. I cant understand at all. Is anyone going through or gone through similar