My S8 had begun to lag a lot over the past few weeks. Music will skip sometimes, the volume control buttons stop responding, swiping notifications away leaves empty white space in place, and the most annoying of all, my navigation buttons will not come up when I swipe up. I'm not sure what is causing my phone to lag so much. I have about 12.5GB/800MB free for storage/RAM.
Hey @spaminathan, just trying to add in some additional resources in case you need a step-by-step walkthough on how you can back up your data and perform a factory reset. Please check out our support articles including: http://www.samsung.com/hk_en/support/skp/faq/1058404 and http://www.samsung.com/hk_en/support/skp/faq/401927