Poland's new rash of labor unrest continued today just five days before the start of an important Communist Party congress that is being closely watched by the country's Soviet Bloc neighbors. Employes of the state airline, LOT, and transportation workers in the northern city of Bydgoszca held warning strikes to press disputes with the government over personnel matters. Today's actions follow an hour strike yesterday by port workers on the Baltic Coast demanding improved working conditions and higher social allowances. As a result of the LOT strike, virtually all air transport over Poland was halted between 8 a.m. and midnight today -- although a couple of foreign carriers managed to land at Warsaw airport -- and a general strike has been called for July 24 unless the dispute is resolved by then. Both warning strikes today were organized by local chapters of the independent trade union federation Solidarity. Solidarity leader Lech Walesa, however, criticized the strikes coming so close to the congress, saying they could be interpreted as suggesting the union was against the congress, Reuter reported. "If we go on shaking the country like this all the time, we won't achieve anything," he told a rally at Gdynia, on the Baltic Coast. "The most important thing at the moment is that we should not fight against ourselves." Yesterday longshoremen in Poland's Baltic Sea ports struck for one hour inprotest over the failure of the government to honor a pledge to provide them with a charter covering their rights and working conditions. While the new unrest is sctterd and involves predominantly local issues, it has come at a bad time for Poland's Communist leaders, who are preoccupied with preparations for the congress. They are anxious to demonstrate to the Kremlin that, despite the democratic changes of the last 10 months, the party remains in full control. Final arrangements for the congress are to be made at a Central Committee meeting Friday. A large majority of the Central Committee, the party's policy-making body, are expected to lose their posts at the congress, which opens Tuesday. The last serious labor unrest in Poland was at the end of March when a nationwide general strike, over allegations that police beat union activists in Bydgoszcz, was only narrowly averted. An appeal by parliament in April for a two-month strike moratorium was respected by Solidarity and the truce was extended into the period of mourning for the country's Roman Catholic primate, Cardinal Stefan Wyszynski, who died in May. Another event that could increase tension was today's Supreme Court decision to order the rearrest of three dissidents belonging to a nationalist movement known as the Confederation for an Independent Poland. They are on trial on charges of conspiring to overthrow the state. The dissidents, led by a former journalist, Leszek Moczulski, were arrested last fall but released last month following a nationwide protest. The campaign, initiated bySolidarity, included hunger strikes and demonstrations by university students. Explaining its decision, the Supreme Court said the three had violated the terms of their release by taking part in political activities. The Confederation was formed by Moczulski two years ago and its members have been accused of seeking the overthrow of Poland's Communist regime and its replacement by a rightist, anti-Moscow government. The LOT strike was called to protest the government's refusal to accept the airline workers' choice of a new KOR, a workers' defense group, and "the right wing of Solidarity." The timing of the article and its appearance in the armed forces newspaper suggested continued Soviet efforts to shore up positions of Kremlin loyalists in the Polish Communist Party before its congress next week. But the restrained tone also suggested growing Soviet concern about the prospect of social and economic chaos in Poland.