iPhone ResetCounter Crash

I have write a native c executable program and run it on iPhone4. First, it works well, but after a period of time, it will cause iphone reboot every time when I run it. There is a Crash Report in /var/logs/CrashReporter, name is ResetCounter-2012-02-23-203134.plist. Can any body tell me what is happend? Thank you.

<?xml version="2.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

    <key>AutoSubmitted</key>

    <true/>

    <key>SysInfoCrashReporterKey</key>

    <string>18a43ae69755297d4e14405a1f7b7a8119557668</string>

    <key>bug_type</key>

    <string>115</string>

    <key>description</key>

    <string>Incident Identifier: B7F9154E-C607-4706-AF42-0FF04594114B

CrashReporter Key:   18a43ae69755297d4e14405a1f7b7a8119557668

Date: 2012-02-23 20:36:50 +0800

Reset count: 1

Boot failure count: 0

Boot faults: 

Boot stage: 0

Boot app: 0

</string>

    <key>displayName</key>

    <string>Reset count</string>

    <key>name</key>

    <string>Reset count</string>

    <key>os_version</key>

    <string>iPhone OS 5.0.1 (9A405)</string>

    <key>version</key>

    <string>101</string>

</dict>

</plist>