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If you are curious about tropospheric ducting this[1] site shows openings determined by looking at what packets are coming through APRS igateways. Some of the LoRa stuff runs on UHF so it could be subject to similar openings(like the huge one over the midwestern US right now.

[1] http://aprs.mountainlake.k12.mn.us/

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Troop is not going to be so strong as it is in 2 meter (140-144 MHz) band but 900 can bounce strongly off meteor trails, the moon, etc. Reflections off airplanes could be a big deal too.

Sporadic long range channels could be a bug and not a feature for this kind of system because if you are not a ham who thinks it is a blast to talk to someone 500 miles away on a a handheld, you want a radio system to work predictably and not be interfered with by distant stations.

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