Why does the crank sensor keep going out on 2005 nissan altima?

There is a recall on the crankshaft position sensor for your car; it's NHTSA Campaign # 07V52700. The recall mentions that the sensor "overheats" causing it to loose signal. According to the information on the NHTSA website, the remedy is for dealers to program the engine control module. I suggest first calling your local Nissan dealer to see if your car is covered under the recall. If it is not, I suggest contacting a professional repair facility, such as one listed here: https://repairpal.com/repair-shops, to diagnose your problem firsthand.