c++ /dev/ttyS0 disconnect every 10sec

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http://ubuntuforums.org – I have successfully created a complex application with QT C + + in ubuntu 12.04 32bit (AD255 itx motherboard). I used a connection of RS232 Modbus /dev/ttyS0 but had some problems. So now I use / dev/ttyUSB0 successfully. as a test I have compiledstephane1.txt correctly a simple connection with libmodbus in C + +. The attach. Libmodbus works well. / dev/ttyS0 does not work well. But when I turn on the PC for 30 minutes, the Modbus connection is interrupted about every 10 seconds and about 10 seconds later resumed. After 30 minutes everything works ok. If you use / dev/ttyUSB0 instead of S0 (Hardware)