i have this problem also with my iP4 and my previous iP3.
i think it's hardware problem. mine i suspect it's dusty.
also check this out http://discussions.apple.com/thread.jspa?threadID=2595841

anyone claimed warranty from Maxis before? i know that the warranty is from Maxis not Apple, so we might be getting refurbish set. isk

I've tried restoring and restore from backup. Doesn't work. I think it's hardware problem. It wont help

refurb set and once in a while home button prob.
tough call...

went to Maxis @ Pavilion last night to inquire.
the fella tried my phone and he managed to encounter the error 2 times.

when asked about the claiming procedure he said they send your phone to check (10 - 15 days) and will try to fix it. if they couldn't fix it they will give you a new set. he didn't answered me if it's a refurbish set but he insisted one on one exchange.

will send mine for warranty after iOS 4.3 jb is out. this time i'll be going to KLCC. HQ better.

massaging on the phone... i'm skeptical but desperate. will give it a try

unless your phone is less than 1 month old, making a big huha might get you a brand new set on the spot.

i've been to the Maxis Center in Pavilion. the fella said they will send the phone back to their team to check which will take 10-15 days time. if they can't fix it they will replace you with another unit.

i've tried asking if the 'another' unit is a brand new set or refurbish set, the so unfriendly fella said "we have this one on one replacement policy for iphone"

although the problem is annoying me, i still haven't send my phone back for warranty. i can't imagine separating with my phone for almost 2 weeks time!

if i'm you i will go ASAP and ask for a new set on the spot. no way they're going to make you wait coz it's only 1 week.

did they make you wait or they gave you on the spot?

maxis or digi bro?

bro, did they restore your phone to the latest OS for checking purposes?

i went to Menara Maxis yesterday and got my phone checked. the buggy home button is working 7 out of 10 times and sometimes 3 out of 10 times, depending on its mood.

i was told to go back and get a replacement set tomorrow. saw my friend's replacement/refurbished set, looks like a new one. got my phone on the 1st day of launch last year, guess i'm fine with getting a 'new' set.

ok latest update. i went to Menara Maxis today. apparently my warranty's 'serial number' is not registered in their system YET after i got the phone on the 1st day of the launch. it'll take them 24-48 hours to get that done then only i will get my replacement set. were in a good mood today, didn't make a big hu-ha. now i regret. will be filling up their Contact Us form right after i submit this. bah

finally got it after calling them twice a day since Wednesday.
everything works fine now. loving my 'new' set. activated multi gesture to avoid pressing the home button.
maxis users, just go get a replacement set, it looks brand new irregardless if it's refurb set or not.
cheers!