Failed to collect changes from VCS (SVN)

We have Teamcity and SVN in Docker Containers on one host. Since last but one update we get sporadic errors for different build configs:

Failed for the root '"MyProjectName" {instance id=139, parent internal id=34, parent id=FD_CROSBY_PROD_CypressTestsRoot, description: "svn: svn://MyServer.com/branch"}: Error getting current revision: svn: E210003: Unknown host MyServer.com: Try again

Stacktrace:

jetbrains.buildServer.vcs.VcsRootVcsException: Error getting current revision: svn: E210003: Unknown host MyServer.com: Try again

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector.createRootException(VcsChangesStatesCollector.java:69)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector.getCurrentState(VcsChangesStatesCollector.java:111)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector.lambda$null$1(VcsChangesStatesCollector.java:103)

at jetbrains.buildServer.util.NamedThreadFactory.executeWithNewThreadName(NamedThreadFactory.java:76)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector.lambda$getCollectStatesTasks$2(VcsChangesStatesCollector.java:54)

at jetbrains.buildServer.vcs.impl.ImmediateFutureExecService$2.call(ImmediateFutureExecService.java:5)

at jetbrains.buildServer.serverSide.impl.ImmediateFuture.get(ImmediateFuture.java:63)

at jetbrains.buildServer.serverSide.impl.ImmediateFuture.get(ImmediateFuture.java:73)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector.collectStatesForAllRoots(VcsChangesStatesCollector.java:56)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector.getCurrentStateSnapshot(VcsChangesStatesCollector.java:19)

at jetbrains.buildServer.vcs.impl.VcsChangesFetcher.getStateAndCreateChangesCollectingTasks(VcsChangesFetcher.java:56)

at jetbrains.buildServer.vcs.impl.VcsChangesLoader.doLoadChanges(VcsChangesLoader.java:48)

at jetbrains.buildServer.vcs.impl.VcsChangesLoader.tryLoadChanges(VcsChangesLoader.java:14)

at jetbrains.buildServer.serverSide.impl.VcsModificationChecker$CollectChangesAction$1.run(VcsModificationChecker.java:9)

at jetbrains.buildServer.util.NamedThreadFactory.executeWithNewThreadName(NamedThreadFactory.java:76)

at jetbrains.buildServer.serverSide.impl.VcsModificationChecker$CollectChangesAction.run(VcsModificationChecker.java:5)

at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1736)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)

at java.base/java.lang.Thread.run(Thread.java:829)

Caused by: jetbrains.buildServer.vcs.VcsException: Error getting current revision: svn: E210003: Unknown host MyServer.com: Try again

at jetbrains.buildServer.buildTriggers.vcs.svn.TCSvnUtil.rethrowAsVcsException(TCSvnUtil.java:367)

at jetbrains.buildServer.buildTriggers.vcs.svn.SvnChangesCollector.getCurrentVersion(SvnChangesCollector.java:61)

at jetbrains.vcs.api.services.impl.RepositoryStateServiceProvider$1.getCurrentState(RepositoryStateServiceProvider.java:3)

at jetbrains.buildServer.vcs.impl.VcsRootInstanceImpl.lambda$getCurrentState$2(VcsRootInstanceImpl.java:8)

at jetbrains.buildServer.serverSide.impl.BaseAccessChecker.runWithDisabledChecks(BaseAccessChecker.java:31)

at jetbrains.buildServer.serverSide.impl.SecondaryNodeSecurityManager.executeSafe(SecondaryNodeSecurityManager.java:30)

at jetbrains.buildServer.serverSide.IOGuardInitializer$IOGuardDelegateImpl.allowNetworkAndCommandLine(IOGuardInitializer.java:3)

at jetbrains.buildServer.serverSide.IOGuard.allowNetworkAndCommandLine(IOGuard.java:117)

at jetbrains.buildServer.vcs.impl.VcsRootInstanceImpl.getCurrentState(VcsRootInstanceImpl.java:116)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector$CurrentStateOperation.call(VcsChangesStatesCollector.java:2)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector$CurrentStateOperation.call(VcsChangesStatesCollector.java:3)

at jetbrains.buildServer.vcs.VcsOperationProgressProviderImpl.runWithProgress(VcsOperationProgressProviderImpl.java:29)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector$1.doGetCurrentState(VcsChangesStatesCollector.java:2)

at jetbrains.buildServer.vcs.impl.CurrentStateCache.getCurrentState(CurrentStateCache.java:36)

at jetbrains.buildServer.vcs.impl.VcsChangesStatesCollector.getCurrentState(VcsChangesStatesCollector.java:78)

... 18 more

Can you help us further?