Mine has dropping at home also...5s on iOS 8.1.3
It's possible you have a bad iOS installation. If you have the time, locate the ipsw file on your computer and then delete it. Afterwards, do an iTunes restore and see if that helps.
Will try...happening on both my daughter's 5s's also.
Thanks D!
Good ideas... Might also consider finding an app for computer that will scan/analyze wifi networks... See what channels people around you are using... And set yours for other, hopefully unused channels in close proximity.Change wifi channel on router. What country you are? UK most best channel is 6 or 11 on 2.4Ghz. If you have set band 5Ghz change channel to 48. Most default is for 5Ghz.
What router you have. I have worst expierence with router what ever I had is Netgear. All Netgear routers has same problem. Lost DNS. Only helps to restart router. I have Asus RT-AC68 and no problems with it.