Back,home n app drag button,slide down menu vanishing problem

[SagarJani19]

M Fed up of dis phone.!!only 1yr n 4m has gone,n its bothering me continuesly..

2 Times it happend...
Diff kind of bugs came, "your settings has been stopped" "your contacts has been stopped" n diff bugs for all apps..

I contacted cust. Cre,n did software repait 2 Times,now s diff m weird problm has started

Back,home,n d 3rd button and d slide down menu vanishes automatically.. It doesnt come back..!!I have to restart my phone 2-3 Times,n den after also same problm,within 30-40 min. Of usage,it starts again..m Fed of dis...sonyz brand!!
.please advice me..

[Uliwooly]

@SagarJani19

The problem could be that this phone has only 1GB of RAM, apps are getting heavier and heavier, Android will free up some needed RAM by closing certain apps and/or services, that could be the issue here. 

[SagarJani19]

I have 200 mb free on my internal.. 1gb ram man...den also dia problm..nyways... How d I solve dis..get it straight n help me

[Uliwooly]

@SagarJani19

uninstall taskillers, antivirus, battery apps, apps that are heavy and run in the background all the time.