It could be. The main way rHGH degrades in lyophilized form when exposed to high heat is losing “conformal stability”. In other words, the damaged rHGH monomers unfold, expose “sticky” parts usually kept within the folds, and start a chain reaction of aggregation. Sometimes, depending on conditions (concentration, PH of the BAC, amount and type of excipients) getting so big they form visible particles. Most of the time they’re sub-visible, so the solution looks clear, wasting some percentage of rHGH because aggregated rHGH is inactive, and worst of all triggering immunogenic reactions.
Aggregates are either soluble (reversible) or insoluble. If you get a cloudy solution you can try adding more BAC. If the particles seem to spontaneously disappear a few minutes later , ( not just become more dilute and still there), you may have reversed them by lowering the concentration.