Guys I'm having a problem when I write/save many files in Raspberry Pi. 

I'm using the RaspiCam to record videos in HD and at the same time I'm collecting alot of data and writing them in XML files every 1 second. The data are collected at 10 Hz.

I don't know why, but sometimes when I'm saving the XML file, it takes 3-4 seconds to save the file, that's too much. It happens once within 30-40 seconds.

It occurs very often and I'm losing data because of that. I tried to debug and I noticed that when it occurs is where I call the function **fopen**.

Does somebody know, what is happening?

I'm using the **tinyxml2** library to write and save the XML files. 

**"Edited"**

Here is a log file that I did to see what times it's freezing. 

    [INFO]: [OBD Buffer]: 0	[GPS Buffer]: 26	[IMU Buffer]: 3	 [XML Time]: 0.988022(s)
    
    [INFO]: [OBD Buffer]: 2	[GPS Buffer]: 45	[IMU Buffer]: 22 [XML Time]: 2.89335(s)

As you can see, the XML files was saving normally, but suddenly he took 3 seconds to save. And because of that, as my other threads still running and collecting data, after some time my OBD/GPS/IMU buffers gets full and I start to lose data because the XML is freezing when saving.