Why is my facebook chat not working properly?

[Nik Bulante]

Can somebody explain to me this:

I use google chrome. Before, my facebook works just fine until recently, my fb chat began to malfunction. I can still use it but the people who I chat with tell me that I "go offline" every now and then.
I tried to open my account on mozilla but the same thing happens there.
My brothers use the same computer but they don't seem to be experiencing any problems with their facebook accounts.

Please help. Thanks.

[Asmaul Islam]

Use IE8