rosserial arduino Serial Port read failure

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Hi, I've written a small sensor_msgs::Imu publisher on a arduino micro which works for a short time but crashes after some seconds with following status:

[INFO] [WallTime: 1402665675.175567] Note: publish buffer size is 512 bytes
[INFO] [WallTime: 1402665675.176102] Setup publisher on /imu_data [sensor_msgs/Imu]
[WARN] [WallTime: 1402665687.484972] Serial Port read returned short (expected 1 bytes, received 0 instead).
[WARN] [WallTime: 1402665687.485703] Serial Port read failure: 
[ERROR] [WallTime: 1402665699.934101] Lost sync with device, restarting...

I supposed this might be some buffer overflow, which is why I increased the nh.spinOnce() during the loop to no effect.

What does the message mean and how can I fix it? Thnx in advance.