hi... im a sgs2 user for almost half a year and during that duration i've already sent my phone to Samsung to repair for about 4 times due to

1: no network connection (sent in three times)
2: screen blacked out

when everything is finally working out fine for almost 2 months my phone is having some problem again.
i dint root it or downloaded any things outside of the android market.
so the current problem now im having is

1: the samsung kies thingy kept on pop up even when i dint connect it to a pc
2: delay when plugging in my phone to a charge for it to charge. means that when i plug in the charger it wont start charging immediately
3: the 'battery fully charged.Unplug charger' thing wont disappear on top of my screen
4: and when i tried to check my battery using the *#*# thing it says that battery health is over voltage..

can anyone tell me is there any other way i can get my phone back to its normal status without having to send in to the factory again? cuz they take a shit whole lot of times to fix it.. i've already tried to reformat my phone and even factory reset everything but the problem is still there..

my sis is using a sgs2 also but she dint face the same problem as i did..
is there anyway i can call samsung to replace my old phone to a new one ? cause i've heard that maxis is providing a 1 - 1 change for iphone users . is that applicable for sgs2 too ?

help is appreciated.. thanks

well.. for some reason my phone is working out fine all of the sudden without swapping the battery with my sis lol..