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You will get bubbles in the line when it changes temp or sits for a while. Remember you are using purified water not degassed water so some CO2 is entering with RO water.
BTW cold water can hold much more CO2 than room temp. So when water heats up it will lose it ablitity to 'store' air, hence the bubbles.
Just minimize contact of your water with the air prior to the effluent line.
Temperature is probably the key.
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