I placed an order on the 28th and tracking information never showed up. This morning I received an email from Fasttech stating that they had a number of complaints from people who'd placed orders on this date and after looking into the matter, they found that:
"the Hong Kong Post confirmed that the packages have been returned by the Hong Kong customs, this might happened if one package in the bag has been suspected contained contraband goods when passing through the security check. This actually happens from time to time.
Usually, the Hong Kong Post Office will inform us within a few days if there is a return happened, but this time they didn't contact us about this issue due to the slow internal handling of the Hong Kong Post Office. Singapore Post do a very good job of informing problematic packages, they usually report to us within 24 hours. This is also one of the reason why we chose to shift most of the packages via Singapore Post."
I wasn't one of the people who complained as I know from experience that the tracking system is erratic at best but it was nice to get an email and a support ticket opened on my behalf and to be asked if I want the package re-sent via Singapore post, which they will automatically do if I don't reply. It's possible that other dates close to the 28th were affected too, so if you ordered around that time and your item was sent via Hong Kong post, it might be worth enquiringly to see if there is a problem!