Hey there, i know this is a bit off but im here for almost the same problem.So i am using oneplus 3 android pie and i have only installed l speed recently. So before i installed this app my connection was stable but after i install this app i noticed instability in my connection. The following situation are some example :
1.When viewing whatsapp status it used to only take a few minutes before im able to see the status but after install it i need to wait for a long time. this shows that my phones connection are not focusing on whatsapp because when i try to download anything, the download will take a few seconds then the download will start downloading with a bit faster speed than usual so i know that my wifi is not the problem but its a problem with my phone.
2.Pubg mobile connection became really unstable because when i open the game to main screen it constantly says that server is not responding or rewuest timed out but at the same time when i download resources in the game it download as usual( i can see at my status bar on my phone the internet speed)this leads me to conclude that the L speed does make my phone download speed a bit better but in the cost of stabilty its making my phone connection not stable. I think that the tweak made my phone focus the internet on downloading the resources for the pubg but it made my phone not giving any internet or maybe if it give, only a little internet to the app itself to load the main screen.
For your jnformation, after i realised this problem, i reverted all the setting in the app then uninstalled the app and reboot but the connection instability still occurs so i think maybe there are some adjusment made by the app but not reverted back in my system. Oh and one more, i tried looking for the init.d folder incase i need to delete scripts but i can only see init folder and the init.d folder is no where to be found. And onemore for your info, when i installed the L speed i used the balance profile and in the LNET section, i only turned on the RIL tweak, tcp and also net speed+ and for the net buffer i occasionally change it between small, big and default.I hope somebody can help me resolve this problem.My only hope is that my internet connection on my OP3 returns tu its original state.