Lost connections (WidComm)
Some versions of the Widcomm bluetooth stack contains a flow control bug that causes connections to be lost due to a buffer overflow. The bug has been detected on stack version 1.4.2 build 1500 and appears to be resolved in stack version 1.5.0.
A workaround has not yet been developed. To ensure that connections are not lost, try to reduce the data transfer rate. If e.g. data is sent periodically, try avoiding spikes and send the data over a larger interval instead.