I've have put 10,000 miles on my K&N Typhoon now, and have never had the filter fall off the MAF housing, or even come loose. Some of those miles have been on very rough, washboard gravel too.
If I were you, I would figure out the issue or re-install the stock filter box. Try cleaning the I.D. of the filter flange with alcohol (and the O.D. of the MAF housing) before reinstalling it. You could also buy a new MAF housing if you think that is the problem--they are very cheap.
Hatch Nation #90
'12 SE Sport 5Dr |╠╬╝|Sterling Grey Metallic|203a|Moonroof|17" Paint/Mach Whls|K&N 57S-4000|FFE RMM|Steeda STB, RSB|JBR bushings
'01 ZX3|╠╬╝|Pitch Black|Prem. pkg.|Moonroof|SVT Snorkel|SVT Springs|S2 Dampers|Steeda STS|Magnaflow exh.