Empty body with 200 response to Sales endpoint

Every time I execute the following (sanitized) request I get a 200 response, but an empty response body. Very occasionally I'll get a 502 response.
https://api.merchantos.com/API/Account/3xxxx/Sale.json?version=2&archived=1&timeStamp=>=,2018-06-09&load_relations=["SaleLines"]&offset=639&limit=1
I suspect it is something similar to https://community.lightspeedhq.com/en/discussion/473/empty-results-from-order-endpoint, but since I'm only requesting a single item, it seems a little hard to imagine. Any help from the Lightspeed staff?
My guess is that there is some corrupted data or something.
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