The service hosting lexigame.com, where the main Chihuahua site lives, is planning to migrate the site to a new server. Hopefully this will increase reliability in the long term, but it will cause some downtime during the process.
The migration is due to be carried out at 10pm Australian eastern daylight time on 31 January. In the Chihuahua time system, this is 3 hours after the opening of the 10-letter puzzle dated 31 January, and 5 hours before the Challenge puzzle of 1 February.
If you find the site not working properly around that time, try the alternate site,
https://chihuahua-puzzle.com/.