Frank Ocean has abruptly canceled a number of upcoming European performance dates, including a tour with Coldplay. The R&B sensation was also set to perform at various well-known music festivals over the next few months.

Ocean announced the decision in a vague statement on Saturday.

"Let me start by saying I feel like an [expletive] right now," he said, "but a tough decision had to be made in regard to my schedule over the next months and the casualties of that decision include my appearances at upcoming festivals in Europe and my opening slot on the European leg of the Coldplay world tour," Ocean said in a statement. "Sorry as [expletive]. I'll be back if you'll have me."

Ocean also nixed an appearance at the Way Out West festival in Sweden.

Organizers of the event announced the cancellation without any explanation as to why the singer pulled out of the event.

"Frank Ocean has just informed us that he will be unable to perform this evening at Way Out West. Both Frank Ocean and we hoped for the best, but unfortunately he will not be performing."

Ocean was replaced last minute by the Looptroop Rockers.

The announcement came after he performed an abbreviated set at the Oya Festival in Norway the night before. According to a review of the concert released by The Music, Ocean sat for much of his performance before exiting the stage after just four songs. An announcement was made shortly thereafter citing vocal problems as the reason for his premature departure.

According to Billboard, the "Novocain" singer has also pulled out of scheduled performances at the Flow Festival in Finland, Pukkelpop in Belgium, and the V Festival in Britain.

Most notably, Ocean canceled his ten city European tour with Coldplay.  The tour was set to kick off in Copenhagen, Demark on August 28th and conclude in Hannover, Germany on September 22nd.

Ocean was set to open for the band and its supporting act Marianna and the Diamonds. 

Last November, Ocean canceled his New York concert an hour before he was scheduled to perform due to illness. He also pulled out of a Detroit concert earlier this month blaming vocal difficulties.

Entertainment Weekly and Pop Crush hint that vocal problems may be to blame for his most recent cancellations as well. Rollingstone and The Guardian are "unclear" on whether or not Ocean's  previous aliment led to Ocean's decision.