My friend came up with this & it seems to have worked ... "I did some research and I enabled a 5 GHz Wi-Fi network instead of using the regular 2.4 GHz setting. My device supports this mode. Since most Wi-Fi routers communicate at a frequency of 2.4 GHz, using the quieter 5 GHz mode gave me better throughput.."
A friend bought an Inspiron 15R 5520 earlier this week & is experiencing poor signal strength & frequent drop outs. I took my Inspiron 15R 5110 to her place, connected to her wireless network  & had no problems at all ... good to excellent signal speed & no drop outs. Can anyone help please? (PS. sorry ... I posted this earlier in an existing thread but didn't realise it had been marked as answered)
Poor signal strength & frequent drop outs