I have a FP3 and ditched most of the standard apps for anything else from fdroid... that helped me.
Or was it the firmware you're referring to?
Open Source Developers Are Exhausted, Unpaid, and Ready to Walk Away
Any experience of Diode?
Today, enjoy your self-hosted home automation
Stumbled on to StormShield - opinions?
Solar PV vulnerabilities
Ansible Playbook - How do I reverse engineer a running system?
OLD System... Upgrade or re-install?
Automated Cooling
Vivaldi, now with added VPN
Options for "iPlayer will stop working on this device"
Any MythTV Users Here?
NAS vulnerabilities
Sanity check: Vivaldi high CPU usage
pfSense DHCP (& DNS) Performance
pfSense DHCP / DNS performance
Pause alerts during the night
Desktop Security
XMPP... on a Pi?
AUR with Ansible
HA redundancy options
Wireshark is the best way as it'll show you exactly what's going on; DNS addresses, traffic type, etc. (But not inside encrypted packets)
But to do that it (you) need to see all the traffic between the ceiling light and the internet, so if you're on wifi and it's on wifi, that won't work.
Hopefully your router has the ability to either do a packet capture, or, mirror traffic to a physical port.