Is it a bug? I think the every electronic products needs to have a reset after a long time and heavy job just like human needs rest at night. How much speed you have ? Have you tried the latest...

Maybe you can leave more bandwidth for your VOIP on the router especially the upload bandwidth. a link shows the instruction: http://www.tp-link.com/en/article/?faqid=194

For wireless devices, you can go to Wireless Statics to check

I do not think it can support SSL at the moment. Is there anyone have any other options expect the Http?Please share.

http://forum.tp-link.com/showthread.php?2395-Problems-of-WDR-4900&region=china I just found this post and you can try to install the Beta firmware to give a try.

I am agree with Lite. If the Beta firmware is from TP-LINK, i think the TP-LINK needs to take the responsibility to offer the warranty....