Multiple ZR2740w failures within one and half year

Hello,
i would like to ask you if it is "normal" for me to have this series of issues with my ZR2740w's (by normal i mean if this is typical problem for this model; i know it is not normal to have that many RMA) :
1) first ZR2740w (let's call it A, bought in December 2011) died completely one month after purchase, panel got replaced via the onsite warranty by a new panel (let's call it B; RMA at end of January 2012).
2) i bought a second ZR2740w (let's call it C) a half year later.
3) C died one month ago after a year (end of April 2013), got replaced by probably a new or refurbished panel (call this one D) :
http://www.youtube.com/watch?v=-NnHiEn42cM
4) D died today, same (or very similar) issue as C; i expect a replacement panel around Friday or next Monday :
http://www.youtube.com/watch?v=bU1wf7QsvWQ
I wonder if it is something at my side, but i can't imagine what, everything else works fine. Socket voltage is withing tolerance (voltage here in Slovakia should be 230V, my socket has 236V which is within the +/-5% tolerance), the issue happens using any of connections (DVI/DP), from any source (tried 2 different computers with 3 different graphic cards - 2x Intel in various computers, 1xNVIDIA), using different power cables. C died when used on Eaton UPS, D died when connected directly to the socket.
While i still have year and half left from the warranty of the older display and nearly 2 years of the newer one, i dislike this happening all the time, as it means i am usually one week without one of my displays, plus i can expect both displays dying within one year after the warranty expires, which is unacceptable for ~600€ display (that is around a half of my monthly salary).
PS: And i don't even mentoin the "running pixels" issue of B on certain backgrounds (gray, blue and similar darker colors) - the pixels are moving from top to bottom, from half to about 3/4 of the display width; this one can be seen mostly when i am closer than 40cm from the display, further away it is nearly invisible (it's hard to catch it on camera, i hope you can see it at the first half of the video) :
http://www.youtube.com/watch?v=zhiPDpSsa3g
PS2: And i am not sure i will be even able to ask for refund once the replacement for D dies again, as it would be the 3rd failure within warranty, but technically the whole panel gets replaced, so not sure if that law applies in this case... Plus it was replaced by an authorized HP service, not by the seller.

Just got a call from service centre, they will replace this display again, and if i get a 3rd failure within the warranty period they will refund me through the seller i bought the display from. Still can't understand why it happens, the only common thing between the failures of C and D is the power socket i get the power from (no issues with other devices connected to the same power line - LCD TV, AVR, two PC's, another ZR2740w, 23xi, Mac Mini), which i cannot change and not even the other ZR2740w has problems with.

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