Ahrefs, Robots.txt and Hard down in Google

Hello People, I hope anyone could help me : For two months, I spend few hours per week to build a little lifestyle blog (40 articles). No AI, no Ads, no affiliate link, no duplicate content, no stealing, and I have a good exp and level in web/SEO in general. Four days ago, while I was growing, I got a huge, incomprehensible strike : from between 1500/2500 impressions for 50/80 clics per day to 100 impressions for 3/5 clics. I can't see any problem in the GSC, and no more where I try to find it else : \- Page Index are "OK" \- Sitemap OK \- HTPPS : OK / Core Web Vitals : Full Good / Breadcrumbs : Full good \- Manual Action or Security Problem : OK \- Links : OK (nothing to disallow) \- Google bot is still exploring the website a lot (between 300 to 400 per day) I cant found ANY FKCNG PROBLEM...! The only thing I found is from Ahrefs : His crawl audit says me that my Robots.txt isnt accessible, and he cant access to my URL for twenty days (I have auto report). For example : \- 3 january : 347 URL crawled (including images) / Health Score : 95% \- 17 january : 413 URL crawled / Health Score : 74% \- 24 jan : 2 URL crawled / Health Score : 0% \- 31 jan : 2 URL crawled / Health Score : 0% \- yesterday : 2 URL crawled / Health Score : 0% \- today : 2 URL crawled / Health Score : 0% But from my point of view, I can't see any technical problem, and I can't more understand where Ahrefs found a crawl problem than why Google erase my website from SERP. The site is accessible, Robots.txt too... If I could, I would have shared even more telling screenshots with you, of course. Could anyone has an idea ? PLEASE HELP ME ('>\_<,) thanks for reading