i have got a XDA 2 mini, and i found that my speaker phone doesnt work properly when my battery is less than 30%. Therefore I rang O2 for assistance, they were pretty good, helping me update rom etc except the waiting was long. After that the problem is still not fix, so I sent it in for repair.

The fault I had report was while using the O2 XDA II mini to call/receive
phone calls , echo was generate BADLY on the other end of the line. This
fault ONLY generate when 1: using battery (not pluged into usb cable OR
power plug) and battery is lower than 30% , 2 while using WIRED headset OR
SPEAKER phone (eg: press and hold green phone button) , 3: Using GSM 900
band , or GSM 900/ 1800 , but NOT GSM 1800. (I cannot test GSM 1900 , cos
it's not available in my australian network : OPTUS & Vodaphone )

they had tried to fix it a few times and even send me a new (faulty ---> sent back to fix, therefore it became refurbished unit... ) and the problem is still there.

I even recieved a email from the australian repair centre's manger saying that " As the echo
problem appears on the replacement supplied to you I believe it is just the
way the phone behaves and another repair will not be able to change the
performance of the handset. The only advise I can give is to adjust the
volume when on speaker phone to see if the echo deminishes."

nevertheless, adjusting volume doesnt help at all...

I just wonder do you guys got the same problem?
Or it's just my bad luck?