Hi Richard
I use ICDSOFT not seen that scenario in the last 6 years . I would contact support at ICDSOFT if you think its server related there very efficient and responsive .That said my gut feeling is something incorrectly set in the Filezilla itself settings/preferences but I can't confirm that .
please read carefully regarding updates , for the last few months I have compiled updates to have all known fixes etc since March 1st ,as from tomorrow all future updates will only contain fixes if raised *note universal fixes not features etc .Update files will be considerably smaller from there on .
Todays update has all the stuff I have or was working on prior to July ,for the last three days I have tried to look at everything and monitor ,too date I didn't see anything significant to warrant a concern, but who knows
as prior to July I won't be on hand daily to respond or answer anything reliably or in a timely manner from tomorrow evening.
Autumn 2021 will see more focus on releasing a paid version , current version will always work as it would today , paid version has a completely different live data API structure and code so this current version will not work with paid version , I will at the time release a update to allow update from this current version to paid version.So future looks bright

perfect winter project to perfect...
Download Update 11th July 2021
* (13:00) CSS file cleaned out unused code now sits at 95kb unminified !
* (13:00) Adjust chart contrast
* (13:00) Charts are fixed Dark theme
* (13:00) Removed old unused dark/light theme files from download/updates
* (13:00)
Future updates will only contain fixes, therefore no more feature requests or ideas will be applied until new PAID version due for autumn 2021
* (13:00) Future updates with fixes will be considerably smaller in file size
* (13:00) Last significant update until paid version release in autumn 2021
* (13:00) Update contains various features worked on prior to July 2021
* This update contains all updates,fixes since March 1st
* Please always do a *backup before running updates