Recently (starting maybe 2 days ago), some good interwikis have been being randomly removed by interwiki.py. I could not find any pattern. Running the interwiki bot twice for the same set of pages sometimes removed links on some pages, and sometimes in other pages in which it didn't remove before. But those pages exist with the same name (I'm running in -wiktionary mode).
interwiki.pt -family:wiktionary -lang:pt -wiktionary -auto -cleanup -async -pt:1 -start:caj
Getting 60 pages via API from wiktionary:no...
[...]
And yet the removed page link is valid: https://no.wiktionary.org/w/index.php?title=calcetariam&action=history&uselang=en
You can see another example at https://pt.wiktionary.org/w/index.php?title=cat&action=history&uselang=en , where many interwikis links were removed on October 11 2013, and readded after I ran the same bot just for that page.
This problem is causing my bot to be blocked in some projects.
Pywikibot: [https] r/pywikibot/compat (r158, d6960b9, 2013/10/12, 14:56:32, ok)
Release version: 1.0b1
Python: 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit (Intel)]
config-settings:
use_api = True
use_api_login = True
unicode test: ok
Version: compat-(1.0)
Severity: critical