Bulky queries might be refused with error: "Remote connection closed unexpectedly" (faced with queries on roads). Another issue which might arise sometimes is "Response 504 (The server is probably too busy to handle your request)", while the same queries are usually working.
Possible solutions are:
test out other OSM endpoints compatible with Overpass Turbo API
switch to ohsome API instead of Overpass Turbo API
chunking the input bounding box into small ones, run series of queries for each of them
Bulky queries might be refused with error: "Remote connection closed unexpectedly" (faced with queries on roads). Another issue which might arise sometimes is "Response 504 (The server is probably too busy to handle your request)", while the same queries are usually working.
Possible solutions are:
It is related to #3 and #7 issues.