Over the weekend I replaced the chain on my 2019 Turbo Vado 4 as the chain was down to 0.5% wear. Today, I went out riding and could hear a clicking sound somewhere from the drivetrain especially when the motor was assisting. Initially I thought the rear derailleur needed to be re-indexed but making small adjustments made little difference. It then dawned on me that because my bike has a Praxis Wave chainring I may have placed the chain on it incorrectly. Sure enough when I checked it was not lined up as shown on the chainring and a quick realignment by moving the chain one link on the ring silenced the clicking sound. If anyone else has a similar issue then best to check the chain is aligned properly. At one point I thought it could have been due to a worn chainring or cassette with the bike having done 3500 kilometres but luckily it was a simple fix. I have attached a picture from Praxis and in fact on my chainring there is a clear picture stamped onto the inside of the ring showing how it should be aligned. Hope this helps.