The 3G telephone and Internet system operated by the Instituto Costarricense de Electricidad failed Monday. The company said the outage was 50 minutes.
The outage began at 10:20 a.m., the company said.
Affected were a number of major businesses and banks.
The company issued a short press release in which it spoke of inconsistencies between routers. That may mean that technicians were changing Internet protocol numbers again. That was a source of frequent Internet outages several years ago when the Acelera program was new.
The company said its technicians would inform the Superintendencia de Telecomunicaciones. Thousands were affected.
Radiográfica Costarricense S.A. and Amnet, two major Internet providers, did not seem to be affected, although the Internet has been behaving sluggishly with these companies for a week.