Apple could face production issues for its new iPads in the coming weeks or months. Reuters says China is experiencing its worst heatwave in 60 years where rising temperatures and low rainfall led to a drop in hydropower generation. As a result, factories of lithium, fertilisers and other metals were told to cease operations or reduce output till 20 August to prioritise residential power supply. Analyst Ming-Chi Kuo claims iPad production plants in Chengdu and Chongqing may be affected. If the power outages end on 20 August, impact on iPad production "should be limited". However, Kuo cautions Apple's new product…