My S8 plus has been flawless so far after two months I can't find anything to complain about. No lag or freezing and it's as snappy and fast as it was on the first day. I also don't load any offbeat or junk apps on my device and I do daily cleaning using the maintenance app and a few others. I still can't believe how well this device works its the first Android device that never lagged or froze up on me.
Had my Verzion 8+ since launch with about 300 apps installed and 6GB free. Still no reboots here. I have with a few Android devices in the past. The craptastic Moto DX2 being one that did- a lot. Returned it.