In the last week or two I started having some issues with the 5 KL125 bulbs in my house (software version: 1.0.6 Build 210813 Rel.153518). I mostly interact through Home Assistant but I'm noticing issues using python-kasa directly as well. To narrow down the issue I pulled a spare bulb (software version: 1.0.7 Build 211009 Rel.172044) that had been sitting in a drawer and tested the same and that one still works great in HA or python-kasa:

Works well: 1.0.6 Build 210813 Rel.153518
Issue on: 1.0.7 Build 211009 Rel.172044

To reproduce:

kasa --host 192.168.1.205 --type bulb state - works well
kasa --host 192.168.1.205 --type bulb off - turns off as expected 
kasa --host 192.168.1.205 --type bulb state - Unresponsive (Unable to query the device 192.168.1.205).  Sometimes turning off and on via the Kasa app on my phone helps but haven't pinned that down

When I try this on the older Software Version bulb, it works just fine between on / off / state. Works great in HA as well

The Kasa app also seems to still work consistently but if the bulbs get into a bad state via using python-kasa I have had to power cycle them to get them working there as well. If I only use the Kasa app, it seems like they work consistently.

I'm not sure if this is the same issue as #320 but mine definitely feels like the TP-Link Software Version is the difference...I hadn't logged into the app on my phone in a while but had to the other day to reset a device and I wonder if this version got pushed out.

I also have a KL110 (Software: 1.8.11 Build 191113 Rel.105336) that seems to work just fine with python-kasa so whatever the issue doesn't seem to affect that model / software version)

Questions I have:
Is anyone else seeing a similar issue?
Is this a known problem?
Is there a way to rollback the Software Version (even just to test)?

I've really liked these bulbs and this project (and it's integration into HA) has made them outstanding and a big part of my smart home. Let me know if there is anything else I can do to troubleshoot.