Cannot append discontiguous TimeSeries error in detchar.py

@geoffrey.mo @leo-singer @deep.chatterjee On production there is an error inn production nof teh type:

Cannot append discontiguous TimeSeries
    TimeSeries 1 span: [1244938180.4921875 ... 1244938180.9921875)
    TimeSeries 2 span: [1244938181.0 ... 1244938182.0)
From gwpy/types/series.py

Generate by line 402 of detchar.py

  idq_probs = dict(check_idq(caches[channel.split(':')[0]],
                              channel, start, end)
                    for channel in app.conf['idq_channels'])
### calling code at line 244 
           idq_prob = TimeSeries.read(
               cache, channel, start=start, end=end)

Please check that this is not a bug in gwpy connected to rouding that results in two TimeSeries appearing as discontiguous even if they are not. Floting point numbers have just 16 decimal digit precision.

I was not able to locate the two time-series that the program try to join to chck this is the case and that may results in DQV/DQOK label in a wrong way.

This error is shown in: https://sentry.io/organizations/ligo-caltech/issues/994063308/?environment=production&query=is%3Aunresolved&statsPeriod=14d