Thanks for the help

40% humidity is still to low and you'll likely end up with issue again, VPD is very important part of the plants health if the plant isn't transpiring properly the water intake will slow down and the salt intake will as well and then they build up over time and you get another lock out, I would want my want my humidity around 70% at the stage of veg you're in and the temp 26C would put you in a really comfortable zone...But 40% is very low...80% of deficiencies with plants usually turn out to be from a VPD issue, if the plants transpiration is in check they're taking up Co2, water and nutirents consistently and perspiring O2 and water properly...Just food for thought...Best of luck