Purchased a new vanilla S21 3 days ago. Extremely poor video playback performance, constant stuttering and artefacts. All tested on YouTube, Netflix and embedded players. Downloaded and via mobile/wifi. Issues remain regardless.
Phone is also randomly restarting 2-3 times per day, mainly off battery. Haven't noticed a restart on charge.
Please advise? Very disappointed as I usually have had good experiences with Samsung devices since my s6