This appears to be the result of increased signal levels, resulting in more than 65535 counts in the summed bins. The summation is done in software, so this is easy to fix.
Note, however, if we chose to go with a minimal bin configuration, this could be a problem, since the counter is configured with only 16 bits per bin. Altering the counter to store 32 bits per bin is also a possibility, though.
This appears to be the result of increased signal levels, resulting in more than 65535 counts in the summed bins. The summation is done in software, so this is easy to fix.
Note, however, if we chose to go with a minimal bin configuration, this could be a problem, since the counter is configured with only 16 bits per bin. Altering the counter to store 32 bits per bin is also a possibility, though.