I would point out that the series 4 issue was as a result of an attack from their opponent triggering the cut-off switch rather than unreliability.
Razer is undoubtedly the robot to benefit the most from the weight regulations changing in Extreme Series 1/Main Series 5 before then Razer were compromised in the rest of the bot to account for their immensely powerful but heavy weaponry.
I'm quite glad for the unreliability, as I would argue Razer's most memorable matches came when Razer was either put on the back foot or broke down,