Support Wifi probelms

Been reading a few forums and this seems to be a problem, my wifi keeps dicsonnecting where as on my previous iPhone it was on constant. I've adusted it to never sleep, but it still disconnects. Are there any solutions??

Thinking to just replace the phone on Monday when new stock comes in as it's under warranty but doubt that will help???

I'm using other devices and they work fine the wifi never drops on them so doubt it's the router, any ideas?

Thanks
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sorry for the newvb question, never owned a samsung, so how do i do the reset. Thanks