Custom Font Suddenly quit

I have had a custom font in my css code for months, and all of a sudden it isn't working. I didn't change the code, the file or touch anything in it. It simply isn't working. 

Has anyone else seen this? I am wondering if the recent updates did something. 

Hi,

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mine stopped working and after I added !important - worked for 2-3 weeks and stopped again; I checked the url - it didn't download the font this time, so i reuploaded the font again. Now is ok, but every month is something different - for 5 months website - I had 4 times this custom font not working