Serial ATA Pci external card

[asho69]

Hi,
I was facing disk access problems earlier. Windows applications would stop functioning for no reason sometimes and eventually the system reboots. On starting the system again sometimes bios check would fail or it gives disk error. But after sometime windows would perfectly start though sluggisih.
Earlier I had thought it was a hard disk crash but later on I changed the SATA port and and windows boot up was really perfect. But still at times applications hang and system reboots.
I would like to know which is a better option

1. Repairing the onboard SATA ports( it has 4 ports) on motherboard (motherboard is 1 year 5 months old).
2. getting an external PCI sata card. will it match the speed of onboard slots.

I have a BIOSTAR Model (G31-M7 TE) motherboard ver 6.1.

[unidentified]

I guess the mobo might be still under warranty so better replace or fix it via the company and you wont have to give a penny. Other thing is that, if you really think that changing the external PCI sata card would solve your issue then you can obviously do it by spending some money but why to spend if it can be repaired / replaced for free.