Bracket not bad lamp apparently has loose contact

I have this lamp concerned whether its unbeatable price and cycling. From the mount on the bike I am pleasantly surprised, yet it holds quite well in it. The light is not bad either - yes, there are brighter bulbs, but for the price I have already fitted. Unfortunately, however, the lamp from the beginning with slight unevenness (and as rich very small bumps on the road - exchange of deposits, bevels at entrances and exits, etc. - I do not talk of tree roots during downhill mountain biking here) constantly next to the mode switched - usually it is flashing then merrily to himself - and that is to illuminate real disaster, and not to mention the lack of safety times. It gets really mad if you go longer, except that is a mystery to me anyway, what a flashing mode is generally required. Inadvertent switching modes ate here several complains should somehow a product defect be ... Too bad, because that is the whole lamp unusable for me.

Addendum: Easyacc has taken pursuant to this review contact me and - after describing my problem - return mail, promptly and free of charge receive a new lamp. I can not test, but here first kudos for really great service !!

Next Update: The replacement lamp is now working properly. I hope it stays even after prolonged use that. :-)