The LX40 had an atrocious clickpad. The previous LX30 had serious WiFi issues, that I fixed by swapping the card, but it was overall the better device. Then there's issues with trackpoint drifting. On my oldest one the trackpoint simply died.

On my e495 I'm getting weird driver issues, like Windows replacing the AMD graphics driver with a different one, so the Radeon control panel won't load and I can't control that useless VariBright feature. I can prevent Windows from doing this, but then one day the driver was just... gone and I've concluded that it's just better to let Windows do its thing. Also, crashes in Teams with too many windows open and while sharing, seemingly regardless of driver. Weird audio fuckups where the audio output craps itself randomly and starts crackling until reboot (fixed by installing an old Conexant driver and locking it down with group policy).

Also, they make some questionable design choices, like swapping Fn and Ctrl, which you can at least undo in BIOS. My newest one (E16 Gen2 Intel) has FnLock enabled by default (wtf?). Gotta ask why they even removed the separate utility bar above function keys in the first place. And then there isn't even buttons for media control anymore...

Also, don't get me started on Lenovo (Commercial) Vantage, which is an incredibly invasive and janky piece of software, but it does let me limit charging.

For some very fortunate reason I've never had sleep or hibernation problems. Feels like I dodged many bullets over the years.