Sounds like your synchroes are worn, 5th gear and 1st gear wearing is quite common, bear in mind though, like I said, there is an issue with the nut on the end of the mainshaft coming loose, which also affects shifting in 5th

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i