TRANSPORT_UNAVAILABLE, issues: [gRPC error: (UNAVAILABLE) io exception (S_ERROR)

[oleg68]

During a performance test my application sometimes receives an exception

java.util.concurrent.ExecutionException: com.yandex.ydb.core.UnexpectedResultException: replace acc, code: TRANSPORT_UNAVAILABLE, issues: [gRPC error: (UNAVAILABLE) io exception (S_ERROR)]
	at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073)
	at inc.openintegration.xdb.ydbperf.OutstandingHeap.waitUntilUnderLimit(OutstandingHeap.java:45)
	at inc.openintegration.xdb.ydbperf.TrnHandler.doTrns(TrnHandler.java:67)
	at inc.openintegration.xdb.ydbperf.YdbPerf.run(YdbPerf.java:159)
	at inc.openintegration.xdb.ydbperf.YdbPerf.main(YdbPerf.java:129)
Caused by: com.yandex.ydb.core.UnexpectedResultException: replace acc, code: TRANSPORT_UNAVAILABLE, issues: [gRPC error: (UNAVAILABLE) io exception (S_ERROR)]
	at com.yandex.ydb.core.Result$Fail.newException(Result.java:221)
	at com.yandex.ydb.core.Result$Fail.expect(Result.java:173)
	at inc.openintegration.xdb.ydbperf.AccHandler.lambda$write$1(AccHandler.java:147)
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:718)
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
	at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2147)
	at com.yandex.ydb.core.grpc.UnaryStreamToFuture.onClose(UnaryStreamToFuture.java:48)
	at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
	at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
	at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
	at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:700)
	at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
	at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
	at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
	at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:399)
	at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:521)
	at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:66)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:641)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$700(ClientCallImpl.java:529)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:703)
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:692)
	at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
	at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)

After restarting the application it continues to work.

How to troubleshoot this esception and what is the right way of processing the exception?