some problems in z ultra , help plz

my z ultra c6833 has many problems:

1- wifi signal always weak even if i'm sitting beside the router !

2- SIM card not working most of times!

and i asked some friends they told me that's a software problems!

so i waited the lollipop but when i try to update it telling me that the latest update has been recently installed!

any help guys what can i do???

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