Get more air to the unit.
http://waterheatertimer.org/pdf/Bosch_Ventilating_tight_houses.pdfhttp://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdfDon't use household vent fans.Trim back trees, and move stuff away from front of water heater and from around vent pipe.Pilot outage can be caused by tightly insulated house, poor upward draft on flue, other vents or vent fans drafting air upward and causing downdraft on water heater, wind coming down flue pipe, water dripping down flueway, dirty combustion parts, clogged pilot orifice, failed thermocouple, failed gas control valve, low gas pressure, water or air in gas line, super hot location ... or combination of more than 1 thing. If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7