Several times I tried to send coins to the exchange, payments hang and coins disappear from the wallet...
Here is an example of an error on one of the payments:

Status: conflicted
Date: 16.03.2018 08:02
To: ALvz3rtVGTqcFyZwyE7jFB9yu3Rq3BkTaB
Debit: -3400.00 XAP
Transaction fee: -0.01 XAP
Net amount: -3400.01 XAP
Transaction ID: 74bdd984391e7c7aa6bce44c571ac391feffa167f905d0cc55b58886fd27fb83-000