It’s a long shot but is all the firmware up to date?
I noticed a improvement especially when I updated the firmware on the Ikea powerplug. I use zigbee2mqtt in home assistant unfortunately the OTA is not working see this post. But if you run zignee2mqtt in a docker there is a chance you can get it working.
Due to the holiday season I am using a lot of Ikea powerplugs from last year and they have all outdated firmware so i’m experience also some problems.
I’m using a CC26X2R1. I recently bought an antenna for this board because it on a far corner of my house and the coordinator only have a weak connection with a few routers. I hope that with this antenna I can connect the coordinator with a stronger signal to more routers so it will improve the quality of my zigbee mesh (no idea of this will work). I’m still waiting on the slow boat from China.