I have a D-Link DI-524 router and my problem is I can't make any good file transfer to another machine I can only transfer small files but not big files (eg. 15+ Mb) I noticed speed seems to change constantly and then drops and gives up the transfer. Accessing the net with other machine works fine its just file transfer is the problem. The router is placed on the wall that's best reception I get so far. Is there any way to fix this so I can transfer big files (eg. 50+ Mb)? Do I need to buy a faster router or get a bigger antenna?