I have an issue with the 2 tapo c225 cameras I use as baby monitors, they both lose sound when streaming after some time like hour or two or sometimes three etc it's random. 
This is while my iPad and cameras are on the same wifi network so they use local streaming. 
Newest firmware. 
Newest app version from App Store. 

Both cameras are also connected to homekit and the issue happens also there. 

Due to privacy I do block internet access for these cameras but I also tested unblocking it with no noticeable difference. 
 

Please investigate since they become useless as baby monitors if sound stops working. 
 

My wife blames me because I picked them, I like tplink products but this situation makes me reconsider my stance. :/