By Eric Onstad LONDON (Reuters) -The London Metal Exchange (LME) again widened its trading band for nickel on Friday, but for a third session in a row it hit limit down, sliding 12% as the LME faced more technical problems. The metal used to make stainless steel and electric vehicle batteries fell to $36,915 a tonne when it opened. Volumes were scant all day, with only 106 lots traded by 1745 GMT. Few buyers were willing to pay the current price, which remains well above the price on the Shanghai Futures Exchange, traders said. Shanghai’s April contract traded at 218,520 yuan, or $34,413 a ton…